You might need a bigger main jet.
Your symptoms you described EPR are classic signs or either an airleak or running borderline too lean.....If you were running too rich the rpms would drop then youd be fogging the plug and have the engine die everytime you come off the throttle,,,,,,,If the idle picks up its still a tad too leanI knew nothing, I listened to StrayDawg63, and he told me to go to 1.01mm, I thought he was Crazy at first. Mine is alittle rich, and likes to run on alittle back to idle but it disengages the clutches. Might try a .97mm main jet a hair smaller sometime, but have so much going right now. You might start with .97 That's why I went to Widget Supply in Oregon and got a $7 gauge drill set and drill my own, even come with a small drill holder.