Nice shooting, especially given the # of firsts you had that day. Lots of good advice ehre, so I'll give you my 2 cents, and worth every penny you paid.
First, given how the rifle shoots from the bench and on your 1st day in the field, I would hold off making any gear-related changes right now. I believe that your ability to make long-range shots will be limited by your skills right now, rather than equipment. So rather than having your rifle in a shop getting worked on, you should have it in the field, being shot.
As to skill-building, I think your approach should be that you're going to put in 10-15 days of high-quality shooting. (If you're unemployed, that might only be a few weeks!!! Ha!) That typically can mean as few as 20-50 shots per day, but each individual shot counts. It can be more, but it doesn't' have to be. More importantly is what you do with each shot.
First, get/build a logbook. Before you go out again, you should be ready to record each individual shot and have it be a useful piece of data for you as you build your skills.
You are working on 3 things for now: Elevation, windage, and marksmanship.
That's just one way to think about the areas of uncertainty you need to address to make a long-range cold bore shot.
Elevation - it seems this one's simple, because you have a laser. Even better, you're practicing ranging your own shots if the laser's unavailable. Perfect.
Now you need to start figuring out what your dope is for your rifle in different conditions. The ONLY way to do that is to be meticulous in your data-gathering, hence the logbook. Most important for hunting, you need to gather your data for your cold bore shot (CBS) as well as your dope for the different distances, and determine how those change with conditions. So every time you shoot, you need to know where the 1st shot of the day went. Your logbook should have a place to record your CBS; that's the most important shot of the day.
Next, you must have a way to figure out if your zero shifts from day-to-day. If you leave one day with your rifle zero'd at 100 yards, and the next day you come back and it's hitting an inch higher, you have to be able to track it so you can figure out why? Is it temperature? Your hold? Your reloads? Other? If you don't log it, you won't see the patterns. I'm sure there's much more here on building a good logbook, but you need one.
Each individual shot, you should take the shot and record in your book where you think the shot should have gone, based on your sight picture when the shot break. You record your call, and then you compare this to the actual impact. You then use this data over time to figure out how well you're shooting, and what are the variables.
In 10-15 days of shooting, your goal should be to have a good baseline of data for every yardline between 100-some distance TBD. You should also have an idea of what your comeups is at each of those ranges, and some of the variables that affect these range zeros. Now when you gather a distance, you don't need your iphone; you look at your chart for your own rifle and say that 'MY rifle will need X minutes of elevation at this distance, under today's conditions.' That's Goal #1.
Windage - calling your wind will be critical to success. The only way to learn is to do it, so once again, the logbook is critical. You estimate your wind for every shot, take your shot, and then see how much wind was actually out there. The logbook will be critical again, because it shows you what happened vs. what you predicted. Once again, read up on calling wind. I won't waste your time recalling what you might already know.
Your end goal is similar; being able to look out at a target and say 'I see X knots of wind out there, and with MY rifle and loads, I need to dial in (or hold) Y amount of wind to hit my target.'
Marksmanship - this means getting used to doing all the fundamentals of marksmanship with that rifle, prone off a bipod - or whatever position you want to be able to shoot from.
You need to know that you can get on that gun, and your body positioning and shooting fundamentals will be entirely repeatable every time. In short, you need to be confident that any differences in POI are not due to shooter error, or a shift in body position/bipod loading, cheekweld, etc., Your actions need to be consistent and repeatable.
One way is see where you are on this is to have your rifle perfectly zero'd and on target. Then take a shot, get up completely from the position, move around, and then come back on the gun a bit later and shoot again. Shoot a group this way. If the group opens up beyond what conditions dictate, then it indicates that you're not resetting the same way every time. That will lead to your zero shifting from day to day.
Experiment, read, and try different positions until you are rock-steady behind your rifle, and you do not shift your zero.
That's what I'd suggest you do, and completely put any equipment modifications on the backburner for the 10-15 days of shooting. Make each day count, get accurate data from each days shooting and record your notes. It's not about 300 rounds a day, or 8 hours on the range. Don't go out to plink, go out to do some long-range shooting; it's a completely different mindset. It's about high quality shots with complete focus.
After 10-15 days, you will have begun to understand your rifle, you will have started to understand the wind, and you will also have started to solidify YOUR personal shooting position that works best for your frame. Based on those days, you will also start to see some modifications you may want to make to your rifle or gear setup.
For now, focus on the shooting, and wait until you've reached those goals before you worry about gear. After those 10-15 days, post an update, and tell us what you've learned. You'll know a whole bunch more, and you'll have a hundred new questions that will lead you down the rabbit hole of long-range shooting.