What elevation you at? I'm at 800' and when I put mine on last summer I ended up with 340 mains, 27.5 pilot, and I believe I leaned the clip out one position. Started at 300 and went up from there, even though I thought I'd be working my way down Do some plug chops to see for yourself, you may very well end up with a smaller main than I had.
I also had added a K&N with proflow adapter-- I think this breathes a little easier than your foam one and would require more fuel. Hope this helps! There are a few others on here with SSTs, maybe they have more advice to give you.
Did you have any fitment issues with the pipes BTW?