Sorry I can't answer your question.
But do you have the same reg as the Impact? Otherwise Huma doesn't make one yet for the Crown with the larger washers.
I checked when I first got my Crown, because I didn't expect much from the factory reg. But the reg in my new Crown, now about 1,500 pellets/slugs, can probably hang just fine with the Huma.
Yes mine does creep after sitting for a while, but the performance is great. The creep doesn't bother me a bit because all I have to do is burn a shot and it's right where I set it.
Extreme Spread is consistently in the single digits. Last two strings I ran were ES 6 and SD 2, which is as low as I ever got from the Huma in the Wildcat I had.
The lowest I had with the factory reg in my Crown was ES 5 and SD 1.5.