Im 6'1 230 lbs, so quit a bit shorter than you, but I have a very long torso. I have a J107 dragonfly
and have about 3-1/2" of adjustment in it yet, so it may be worth a try (at least check it out). They are alot of pack for the money... if they fit.
My backpacking partner is haveing a similar problem. He's 6"7 and 240lbs, and I dont know how he can use the pack he does. It rides half way up his back. Im eager to find out what you get so that hopefully, my buddy can have a better trip with a new bag.