Do NOT play with your oil mixture as a "tuning tool" !!
(unless you want to seize your motor)
I wouldn't run that PA at any less than 3 oz oil per gallon of gas (43 to 1)
Frankly .. I will be running 32 to 1 from now on in mine (4 oz oil per gallon).
You probably should too.
PA50I's need several small items to get speeded up.
If you use the 'search' .. you will find out what they are.