135i/335i clutch upgrade anyone?

[Falco1992]

I was wondering if anyone here with upgraded 335i of 135i manual can advise me regarding to clutch options.

The stock clutch in my 2008 135i N54 with RB-turbos is not holding the power in 6th gear anymore. Possibly still the stock clutch so could be just worn out, or it just doesn't hold enough power (or just barely when new.)

the car has been dynod at 452whp and 600nm.

I've read different things about the 550i/335is clutch upgrade using stock DMFW witch seems like a good option. But I havent heard from anyone using this clutch with 600nm+
Most people run stock turbos and JB4 using this clutch when the stock one wears out. (370-400hp 500-550nm ish)
The other option far as I know is a 6 or 4 puck ACT clutch wich i havent read a good story about except that it holds the power.

Does anyone know if a 550i clutch will hold 400hp+ or has experience using 550i clutch with such power??