RE: when you tune what you tune first? REPOST
The pinch test will work fine for getting the low-speed in the ballpark. For the high end just get the engine up to temp and make some 3 second wide open bursts, then richen the high speed(clockwise) by 1/8th increments and do another burst repeat and if the engine gets smoother you'll know your going the right way, if not go in the opposite direction. DO NOT get frustrated and start making 1/2 turn adjustments because you will be chasing the tune until you throw the engine off a bridge.
Check your plug and if you haven't already done so take the backplate and carb(pinch bolt also) off and seal the engine up w/ sensor safe RTV and let it cure for 24 hours.