When I was researching packs I eliminated Kuiu from my list. There tended to be a lot of complaints about the packs not being designed for super hefty loads. I also looked at MR but they were super heavy. Maybe things have changed since I looked?
I would highly recommend Kifaru or Stone Glacier. You'll hardly find a negative review on either. I ended up with Kifaru because of the weight and offers so many different bag options. I doubt if there is a more comfortable frame for hauling hefty 100+ loads. Kifaru also offers an impressive line of lid, accessory, pouch, etc options. I was strongly considering SG, however it didn't offer anything in camo.