If I remember rightly you were previously having trouble with popping on the overrun? Did you ever get that sorted? I think both issues are closely linked. Your bike is almost certainly running too lean at idle.

First try calming the revs down on the hot engine with the pilot air screw, rather than the throttle stop/idle screw which you have been doing. Standard setting is 2.5 turns out, but that is fairly weak anyway. You may need to go as far as 4-6 turns out. However, much beyond 4 turns out would suggest that the pilot jet is either gummed up or too small. I went up from a 48 (standard) pilot jet to a 52, with the pilot air screw set back to 2.5 turns out, in order to get a smooth idle on the 1994 3YF I had.

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