Hard to say....and think it'd struggle to get as low as 500hp, so it's never really been used at that level hard as such, other than a few short instances running it n/a.

But that would only have been a few straight line runs rather than anything else. Although when it was like that, it sounded bloody class, and did seem to grip very well.
But mine would also be near 1/2 ton heaver than most Sierras which doesnt help matters.

Despite the inadequacies etc I've used it at hillclimbs here which are road events and whilst it will never be superb, it's surprisingly usable, although being stupid I've never run it fully at as low boost as possible which would undoubtedly make it safer and maybe even faster lol. Just maybe not as much fun.
But the traction control on the Syvecs is very good, although I'd see it more as a safety addition than a real performance enhancer. Although I guess they're both sort of interlinked.

Really though...the last thing in my mind is making less power, I'm happy to tootle about most of the time on the road anyway, and most road surfaces here are crap for grip anyway.

Just let it make whatever power it makes, and enjoy it.