Looking at your set up, I have a few questions. What kind of system did you use to carry you bike?
My pack in an Asymetric 30L from Camelbak. Like most packs it has 2 strips on the side to cinch the weight down. I just open those up and ran them through the frame. I tried it at home BUT the pack was empty and it wasn't too bad. Out there it was way too heavy. The total gear including bike was 55 pounds, minus the wheels I had about 50 pounds on my shoulders.