Well, I have the same setup. My mechanic set me up at 22# every day and can go up to 25+ pounds if I go to the track. 22# and alky on 6'ish and I rarely ever see any knock.
I do have a TA-49 turbo and light supporting mods too, i.e. fresh fuel pump, hot wire, fresh valve springs, etc, etc if that matters.
Sent from my SAMSUNG-SM-G900A using Tapatalk