Good advice, now let me tweak on it a bit,,,
make sure you have at least 1/2 tank of fuel,,,
Warm up the saw good,,,
Also a good Idea to index the handle on your adjustment tool so you can keep track of the turns
then do the above posted by Nmurph,, for a stock saw with just a muffler mod or even a stock muffler I have found for The H setting I come out (CCW) 1+1/2 to 1+1/4 turns from the gently closed position before I crank after doing the L& Idle settings) and she should be 4stroking very plainly,,, now @ WOT close CW until it really picks up rpm and kill it,,, look at H postion set screw make a mental note, now open CCW 1/8th turn or in you case being very touchy 1/16th,,, now re crank,,, it should be barely 4stroking and should clear up nicely in the cut make yourself an index mark on the plastic or mental note what ever works best for you,,, hope it helps
If your adjustment screws are the splined type w/out a screw driver slot disregard looking @ screw,,, pay attention to the indexed driver lololol!!!!!!!