you probably need to go up on the mains as 270s are what came with the pipe and they are intended for a stock bike with an airbox. your running k&N pods which'll need more fuel so if you stay with the pods, I'd say go to a 300 and see how it performs there, if you go to the stock airbox, then try a 290. Also, I'll add that very rarely do the "supplied" jets work perfectly, they're a "guesstimate" for trial purposes mostly. With fatties and mods similar, my bike used a 310 with an airbox. So, I'd try a 290 or 300 and see how it reacts.