did you reinstall all of the stuff you had before? i really could see you running a 3.2 on that setup fairly well, so im kind of on the same page as you.

wait, another idea. youre only knocking when you get into your very rich zone, which is weird. you could be experiencing rich knock. try leaning it out and seeing if the knock goes away.

either way you want to be a lot leaner than you are now.