Maybe the tall guys can kick in a few good suggestions. As tall as you are, you probably have a long torso and need a pack that will adjust out accordingly.
I suspect that if you find something that has a light duty internal frame with at least one stay that will allow weight to transfer to the waist belt, then you'll be better off than you have been. The 5.11 I have would be too short for you though. Get something made for a tall guy.
You might look at climbing oriented pack like something from Black Diamond. I say that because those makers often match sturdy cloth and decent adjustable suspensions to small capacity packs. BD is good stuff but not as high dollar as Mystery Ranch or Kifaru.
