for me personally i would only use picco reds or os plus for picco engines
i ask about clutch if the spring is to tight it will make the bottom flat i would hand tight the spring I'm guessing you using 417 m spring and go 3 hrs richer on the bottom and try the picco plug ., and if you pinch the fuel line for you need to do atleast a 6 count benouse the picco has more timing then the novas