How repeatable or stable is the VXIII in respects to using the turrets? Does they generally pass the test?
The V3 "long range" comes with dial up turrets and side focus for parallax adjustment. The V3 longrange is a very good scope and will do what you are asking very well. On the V3, I just use the standard plex and dial all my shots. For hunting close range in timber, the larger duplex will help for those fading light shots. I don't hunt elk in timber anymore but a little eastern whitetail in the timber is a lot harder to see than an elk and the V3 will do that just fine.
I dial the knobs a lot for antelope hunting
and the scope is perfect. In a day the knobs may go up and down four or five times and sometimes I may even shot, but mostly, I am just getting ready and don't shoot.
So, if you want to keep the cost down and go with a simple and fast solution, buy the V3 Longrange that you suggest with the standard plex and tape your drop chart to your stock and dial the turrets. It takes a little while to get set up for a 800 yard shot no matter what method you use and so sometimes you wind up with the animal just walking off while you are fiddling with gear but that is just the way hunting is. I have had plenty of animals just move off while I was rummaging around for gear or trying to find where I laid my glasses.
I am not saying the Zeiss is a bad scope because I have never hunted with it. I have hunted with the V3 and I know that scope. Just me, I do not particularly like the NF NPR reticles for working in the timber. I have tried it and they are not well suited for that. They are a great long range reticule but not anywhere close to my first choice in heavy timber. A standard plex is so much faster.
I do not believe there is any one perfect scope for everything. If you intend to keep doing what you have been doing which seems to work for you very well then go with a simple and fast scope such as the V3 long range