I just picked up an Ohm 2.0, and Chris was great to work with. I thought I was a medium, but it was a tad small, and he shipped the next size up very quickly. If you can't find what you want on the forum, he may be your best solution.
You sound like a large on the torso length based on when I tried on and measured the large and the medium. Not sure if it's the same with the other packs, but the Ohm 2.0 large had slightly wider and longer shoulder straps. I found them more comfortable for my body (5'11", 215 lbs, very broad shouldered).