Thanks.
I don't think you have the static compression you think you do based on the piston choice. Best bet would have been using the 1" downfill method and measuring the volume to calculate static ratio. That piston has a lower top ring, and tapered "flat" top so there's more wasted volume than typical math might account for. The intake valve closing can be anything really. I wouldn't assume the ramp is designed such that your math works for it. I've always used the KB site calculator. If I use tht and add a couple ccs for the dead space I'm coming up with 9.3 static, 8:1 dynamic. Given you have the big bore, the huge gasket (not sure what that was needed there), and the dead volume around the piston, the timing lead is probably warranted. I would have done things differently myself but that's neither here nor there. If you want to know why, in my opinion that's why: excessive volume in the chamber. I will never, ever use a vacuum gage to set timing either so we're already taking different approaches to performance. But someone posted this sentiment early on: if it likes it, run it.
