I just went back and read most of this thread.
Get focused and complete, or respond to one thing at a time before we all go nuts.
This thread started with your ped running too rich and displaying all the classic symptoms. The following are some questions asked by you, me or someone else which do not seem to have good answers yet, at least in the thread.
Are you sure your needle valve and float are good and there is no gas in the float causing your fuel level to be too high?
Did you determine that the screw in the side of the carb was not supposed to be there?
Have you checked the exhaust port for carbon build up?
Do you have a reed valve and if so, is it ok?
Ther may be more, but for running rich, these will do for now.