Large rpm drop

If it's pulling fuel from the main jets you'd see it. Fuel would be coming out of the boosters.

An O2 sensor can and will lie to you. Not all O2 sensors read the same. Different fuels require a different A/F ratio so tuning to a number is not correct. As I said, put it away until you get everything else correct and then hook it back up. Really, if you can't data log it, and overlay it with RPM, MAP and throttle position, you are still really guessing except at idle and WOT.

I'd love to see a picture of your plugs, preferable a couple of plugs with the shells off.

If you didn't actually measure the volume of the piston at say .500 down the bore, it's still a guess. How did you account for the valve notches?

You showed very little info on your cam. What I was able to see was what is most likely a slow ramp, wide LSA early intake closing cam. If you are at 11:1 and you didn't call someone and tell them what you are doing, the cam will always be wrong.

A faster ramp lobe (doesn't need to be an outrageous lobe) would allow the cam timing to be more agressive (what the cylinder actually "sees") while not giving up driveability.

IMO, you are at least 6 degrees too small on duration and I'm not sure why it's a dual pattern cam. Comp love that stuff but mostly, it's a gimmick.

You might be a range too cold on your plug. It's hard to tell without looking at an Autolite plug catalog. Getting Autolite to send me a catalog has proven futile up to this point.

I'm using fresh, dual O2 sensors, calibrated to gasoline, data logged with rpm.

I work in r&d at comp, went and talked personally with our one of our senior cam designers, who has since retired. It's a roller cam so ramps are different than tappet. Not trying to argue cams but it's matched better than you probably think. What all do you want info wise? I'll try to grab it for ya

Valve notches are right at 5cc's. Not trying to argue engine compression either.

I'll try to pull some plugs today.