I read no excuses, I see reasons.
Stick to your plans, I think you're on the right track.
My brother took his RX-7 to a dyno in AL about a decade ago. The "tuner" was supposed to be a rotary guy. He was a liar. Waste of money on my brother's part. Seems like a lot of tuners out there are just copy/paste pro's.
There are some really, really good tuners out there but once everyone figures that out, get in line - and get your wallet out. Heck, take out a loan.
Anyway, I'm just stoked you're sharing this with us. Very cool man, regardless of the dyno outcome.