Currently guys I have gen II. I weigh 185lbs. with gear on. I believe I am close to the weight of the stock 08 busa springs. I had my sag checked at the busa bash. It was supposely on the money. However, I feel that the bike needs more help. When I ride it, it feels like the front end is light. I have been talking back and forth to Ba Busa, and I am now going with a 190/55r17 on the rear. I did this to my 02 1k, and liked it. Turn in was better, and the front end gave back better feel. I also got a dogbone for the busa to raise the rear too +1. Am I going the riight direction? I my need to get book to help understand the adjustments to the suspension too. I am looking for better front end feel and feed back from the big girl!
I think you're going the right way. And if it doesn't work, its really easy to go back to stock dogbones and a 190/50 tire.