you dont jet for more top end or more bottom end, you jet for the amount of air your motor takes, by modding your bike, it will take more air, hence needing more gas.
is your motor ported ? what jets were in there ?
if its as stock port, with fmf and stock carbs and airbox. id start at 280 main (start at 300 if its still fucking freezing out), 27.5 pilot. you'll prolly end up at around 270/260.
first off, what jets were in there, and how did it ride with em.