First, listen to the well known tuners for advice (Mike, overbooster, etc). You are not understanding many things you are changing and need to read on these forums a bit more to understand how to tune (not trying to be rude). These engines read in lambda, forget about AFR. Shoot for .88 lambda near WOT like Mike said. Smooth your tables. READ READ READ READ other threads about lambda, timing, boost tables etc. Make small amounts of changes to see what affects they have, if you change too many things at once, you'll be chasing your tail too much. Honestly I'd start over from scratch on the tune if you're seeing that much knock.