Hello Tomo,
As you know, the best way is to increase the clutch area (more discs) rather than increase the pressure with stonger springs.
The best option is to use Kevlar friction discs.
Have a look on this :
I have used bandit clutch on big twin engines and I think they are the finest available.
Bandit machine works
I think Alto is able to produce Rocket parts on special order.
ALTO products
What Ron said about Barnett.
Barnett
:wink: