those stock clutch bells are pretty hearty. mine has some scoring. eh, whatever. my scored bell worked better than the so-called "lightened" clutch bell.
I am having the same issue as you, Clayton. only it is very, very intermittent. happens only once in a long ride, but when it happens it's always at a time when I don't want it to.
I have the Paz springs and I spent a lot of time tuning my clutch. I am actually pretty confident in my tuning skills. my clutch is where I want it to be. If it was doing this every other stop, as your post says (is that accurate?), I would totally retune it ... I live in SF and it's all stop and go out where I live. In my case, it is doing it once in a blue moon (per long ride).
I am gonna try changing the fluid and get a new gasket and sealer (been leaking a bit). fluid level has been fine, though. eh, mopeds ...