Neu 15151y on 4s
I use the Integy aluminum 3 shoe with no spring ......Works great....gets a little warm when I'm on / off the throttle alot but grabs smooth and firm...about 4 hours so far.....still looks good....
Try the M2C aluminium clutch shooe medium one with 1.0 spring.
Or get the M2C 3 shooe conversion kit, come with medium shooe and 3 set of different spring.