Still thinking about your miss issue and wonder what Ver/Build you're running on the HP. I had something similar/same happening with an older "build" and it did the same thing. Not every time, not at the same RPM and would just creep up, like bad underwear. After doing more testing and then talking to a buddy, I put the latest Ver. 6 Build 220 in and the issue went away. Reading the update log from Holley said a minor comment about a ghost miss bug being fixed. Hope I didn't post this before, my old brain farts once in awhile.
Love the work you’ve done. Really nice to see the car at this level of “tweaking the details”.