I know the Sgt has said he has back problems, and as someone with 3 buldging discs in my lower back, and a list of old injuries, I kicked the Busa to the curb years ago.
Best motorcycle engine ever...comfort... not so much.
I tried multiple seats, pegs, and bars, including dirtbike bars, and still it was no good for me.
The length of the Busa's tank and reach to the bars is too far for my back to be comfortable.
On 1k's, no problems at all.
So a different bike Can make all the difference!
Try another bike!