I am no expert in this area. From what I've seen, short of a bore out kit, a second stage jet kit with a slip on exhaust and pods should get you up to about 110. From what I have read, installing gsxr cams can add quite a bit more power too, which should/could get you into the 125-130 hp.
Holeshot is a big pusher of the 5 degree timing advancer, Ivans is not. So I think you would have to take it from someone who has it installed as to whether you would want to pursue advancement as an avenue to gain hp.
jesse