I'm pretty happy w/ the ltft's but figured it might help under the curve to cure the knock. I havent checked the sensors yet but im not sure if its really them - mainly because it usually only happens in 4th gear, 25+ % TPS (so under load) and usually between 1500-2100 rpm.

Think its a lack of fuel issue? Or a lack of octane issue? - this is the stock map..
I only see it pull up to 5 deg of timing at most. sometimes its as little as .20..