jetting/idle question

Just a quick question on fuel delivery. My quad is snorkeled with a fo-14 exhaust. I'm running a 135 honda main jet and clipped carb spring for starters. The problem i'm having is unless i run the choke partially on, the engine sputters and hesitates. If I run the choke halfway, it seems run well. Also with the choke off, it idles very rough. At half choke, the idle smooths out. I guess my question is should I change to the 137.5 main jet or am I missing something else? Thanks for any help.