Go with the AV59 up front instead of the 45ST ....I have heard of complaints about the 45ST getting a "wiggle feeling" in the front under low speed and rain conditions.
No disrespect, but I've been running the AV45 up front for over 8,000 miles including riding in heavy rainand low speed conditions. I have not exprienced the "wiggle feeling" you heard about. I recommend sticking with the 45/46 combination. I'm willing to change that with my next front, if you have experience on a Busa proving the 59/46 is a better combination.