Does anyone make a sintered iron full disc with a sprung hub? Seems like that would be the best of both worlds (grip, reasonable plate load, and better street manners)... closest thing I could find was a Ram 900 series (sintered plates, sprung hub).
Nope. If you use a sintered iron disc and it chatters you have way too much base load. I run about 600 pounds of base pressure and that's plenty. No chatter. Smooth engagement.
I'll never run anything else. Been doing it since 2001 and I'd never consider anything else.