Time to admit defeat.----Take to your local shop for help.
you did what exactly....close the choke plat shut ??
I’m buying Ethanol free premixed regular gasMight go out and buy some regular gas, and mix a gallon at a time for testing -- fresh 50:1 mix with 2-cycle outboard oil (a little less than 3oz. oil per gallon of gas.)
Not sure what you are buying for $20/gal.