Sorry, I have yet to own a Kifaru, mostly because they are custom built to order and take 6-8 weeks. I'm sure they are very good, though, and I think eventually I will get one.
Mystery Ranch (MR) packs are great. I have the 3 Day Assault Pack (3DAP), Cerberus, and Behemoth packs. I trust pretty much anything from MR because it's Dana Gleason's current company (as previously mentioned), and still designed and made in the USA.
Also, have you considered Eberlestock? I have the Eberlestock F4 Terminator. It is awesome, and has more than enough room to haul anything. I think I only paid like $400 for it, brand new, and it arrived within days.
I'm not a fan of "lightweight" packs, either, so the weight of any of these packs doesn't bother me in the least. I agree the 5.11 packs are pretty sub-par. I love the Maxpedition stuff. Even though they are not really a full-size backpack manufacturer, they make some awesome gear.
And finally, the Canadian Arc'Teryx makes some of the absolute best hiking, climbing/mountaineering technical packs (and other gear) in the world. They are my absolute favorite of the "civilian" type packs. I don't have any of their LEAF (Law Enforcement and Armed Forces) line yet, but I can't imagine how their Echo 60 pack could ever let anyone down. Maybe that's next on my list to get...