3 stars is too much. It will just make it rev out more and not engage as well before the starter clutches dump the rpms. 2 balls and two springs is pretty rippy but again kinda doesnt grab as well with too little weight. I think on my stock setup I'm not running the inside clutch bell shim with 2 star springs. Ive done almost every combo of stock variator mods, ditching the stock variator weights for malossi multivar weights is a huge upgrade. I would start there and also try reshimming the whole assembly.