1. I've done GOBS of tuning. The fuel map I have built is for my setup.
2. Extensive testing at various AFRs, boost levels, and timing. No change to knock voltage magnitudes.
3. Sure, 93 octane Mobil.
4. As mentioned, yeah. I tried NGK copper heat range 7 as well.
5. I think this will answer your intended question: A free rev from 0-6500, sent to Phil, resulted in "Those are high voltages for a free rev." I'd have to dig around in a pile of logs to get your exact answer, as I don't really do WOT pulls from below 2400 in 4th gear...