MrB
I will definately fix the slop

Edwin,
at full throttle on the ground it doesn't surge at all. I will check anyway

Michael,
don't understand the term "prop unloading" but will try again to tune as you describe.
BTW, my prop is 17x8, we flew a buddies last nite which I set up for him, it had an 18x10 (same engine & plane) ran great.