I have run the SG XCurve and the SO Revo frames. Honestly, I like the SG frame better, but I sold it to try the SO system because it's much lighter overall, and the frame is maybe 90% as comfy. For me, shaving 2lbs off my SG setup was more than worth it, and I love the features and design that SO is coming out with. The Kifaru stuff looks good and they're local so I really want to give them business but all of their packs are over built and over complicated. My guess is that anything from Kifaru, SG or SO is going to work really well for you IF you really know how to get a pack to fit. It takes a while to really learn how to dial everything in and experiment. I'd buy a couple systems and really, really test them. You have the 30 days, use them. Make sure you order at a time when you have the time to load up each pack with a lot of weight and go out and hike in them. Don't walk around the house or around the block, get out there and walk miles in them. You'll learn along the way how to adjust them because they probably won't be right. Each company has pretty good info on youtube for adjusting the pack, that is paramount. They all have a slightly different approach so I'd watch them all, you'll learn something regardless of which pack you're using.