Constant load is different than a shock load ... you aren't on the NO2 as you're shifting and the clutch is fully engaged before you hit the go baby go button.
My stock clutch doesn't slip at all at any RPM if I mash the gas. But if I shift too quick and get on it it'll slip like crazy at higher RPM (because that's where I'm making more TQ).
So for you, Maniac, it works. But for a SC car or high HP/TQ N/A it might not.
I'm sitting around the 150-160 wheel TQ area right now and the stock clutch slips. It's only got 500, or so, miles on it. So I'd say stock should be replaced around the 140-150 WTQ area. If nothing else just to be safe.
BTW, I got 173,xxx miles out of my stock clutch and was near the 130 WTQ area the whole time.