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New exhaust jetting

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I just installed my FMF Shorty + Fatty. I am in the process of jetting it, already tuned the needle, and air screw. Now I'm on the main jet. On the FMF instructions it says to put in a 200 main. They said that they were at sea level, and I'm at 350 ft. They were using 32:1 in Super and I'm using 40:1 in regular. Would I have to go up or down in size from 200?

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I think I have an air leak. I set my idle at a good speed and then ride. Idle is still set good. Then after I pin my bike going down the street, I slow down and it's idling very high. I have to put it in first and slip the clutch to get it to go back down to the original set speed.

It idles consistently but it will raise and drop a few rpms, that doesn't concern me tho because its a 2 stroke.

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