Hey man. I used to sell backpacks at a large corporation and have experience in fitting a lot of different brands, sizes and styles of packs on people with a lot of different body sizes and types. Also, I just bought a Eberlestock J107M pack (which is 2900-5400 cubic inches without the duffel attached). I am almost exactly 6 feet tall, about 220 lbs with a normal, if there is such a thing, torso length.
My first impression of the pack when I put it on empty was, wow, this pack is actually riding a little higher than other packs on the waist strap. I though of this as a good thing. I have found that packs usually have to be shortened up, to fit properly. This is usually done by lowering the shoulder straps. You obviously don't need to do this.
Do you have the x1 or x1e? The x1 is 2100 cu in and is designed as a day pack...maybe a long day depending on the person. The x1 european is 2900cu in. Try to think about it this way: The larger the pack = the more weight the person will carry (typically). The smaller the pack = less need for hip belts. The belt is designed so that, when it is properly attached, the weight of the pack will ride on your hips and legs.
Ok, so as far as fitting your pack to you, do the following. Stand up, and feel your hip bone. You're looking for the iliac crest which is the part of the bone that sticks out like a tip (if that doesn't make sense, google "iliac crest" and look a pic). Your goal is to have the TOP of the hip belt be at the same level as your iliac crest. To most people who haven't been shown how to wear a pack correctly, this will feel like the belt is too high, but it's not. Once that's done, complete these next steps EVERY TIME you put on your pack.
Loosen all the straps that are used for fitting the pack to you (ie, hip belt, shoulder straps, load lifters (the ones that connect the top of the shoulder strap to the top of the pack itself) and sternum strap).
Put pack on.
Buckle and tighten the hip belt.
Tighten the shoulder straps. Do this by first pulling the straps straight down towards your feet and then pull them back towards and past the pockets of your pants.
Tighten the load lifters. They don't need to be very tight. Their purpose is to take just a little more weight off of the shoulders. When hiking on flat terrain, it is better to have them a little more loose. When you are hiking up and or down, tightening the load lifters will take away some side-to-side sway and make this portion of the hike a little easier.
Buckle and tighten the sternum strap. The goal here is to bring the shoulder straps inward just a bit to allow for more arm mobility and comfort.
Release just a little bit of tension on the shoulder straps. This will help settle the load onto your hips.
It would probably be better to do this with weight in the pack so you can actually feel what each adjustment does.
Well, Jon2, I hope this actually helps solve your pack issues. Hit me up with any questions or comments.