"Also, in an Ohm you will be about at it's carrying limit with a 10 lb base weight and 7 lbs of food."
OK, I'll give an opposing view here based on my experience with the OHM 2.0 over the last 2 years. I use it regularly for trips up to 10 days with a base weight between 9.3 and 10.2# depending on a couple of variables, i.e. within OP's base weight range. My food weighs 19.3 oz/day X 9 days plus 5 oz for the last days's lunch which equals 11.1#. Call it 11 for simplicity. So, I have a carry weight of 21# plus a maximum of 3# of water going in over Shepherd Pass on a typical southern Sierra trip. This puts my weight up to 24#. So far, the OHM has performed admirably and saved me 10-12 oz over a Circuit. I have also used an Ursack in my OHM and did not find it to be any more uncomfortable than in a Circuit, which I used pre-OHM. All that said, I will be the first to admit that comfort varies greatly with individual body geometry and sensitivity, so there is no hard and fast answer here. What I would recommend is that OP order both packs, try them out with his intended load, and determine for himself which one best meets his requirements, both in carrying capacity and comfort. ULA is very good about accepting returns in situations like this, so there is no financial risk. FWIW, I am 5'7" and 137#. OP could take this into consideration as well, as most folks are quite a bit larger and the OHM may not fit them as well, especially when it comes to hip belt wrap.