I don't really have any in addition to the other fine replies you have received, but maybe a recap. I had an 06' and it was very comfy for me. I'm 5'8" and 140#. Although I don't have your specific back problems I do have problems with the lower back. I have an extra vertebrae and have damage from falling off mountains, out of helicopters, falling off rappelling ropes, and improperly lifting heavy objects when there was no alternative! The humped over sport bike position feels better to me than the sit-up position of other larger sport-tourers and adventure bikes (and especially cruisers!). My arms are never stretched out and locked. With my elbows bent, my forearm is nearer to vertical and never have more than a light touch on the bars (other than when stopping or putting both feet down). So, as suggested by others, giving it a while to allow your leg, hip, back, and abdomen muscles to develop, will allow taking pressure off the bars improving the riding comfort and more importantly the riding style and safety. My bike did have a Corbin seat, which I prefer to other softer seats as I tend to move around especially in the twisties so sliding the butt is easy. It also had a Helibar riser which I could have done without, but was installed when I purchased and I just left them on. Although the risers may have helped in getting the clearance required for me to adjust the levers down to align with my wrist (very important). My pegs were OEM and although I have a bad right knee that doesn't like being folded for very long, I would rather put up with it rather than lower the pegs. It also had a Puig windscreen which flowed the air stream about mid chest which at about 80-90 mph worked almost like a chest rest! At triple digits I would have to reverse my muscles to keep my forward lean (nice advantage to speed!) and in around 150 needed to tuck in.