too lean ?

Had some really nice weather yesterday, got the fish out and played w/ it for a while . I leaned the fast 2.0 f.inj. down a hair more at cruise and now its popping out the mufflers quite a bit when descelerating, but doesn`t rattle and runs great , DID I GO TOO LEAN ??
Also discovered my rings aren't seated yet.
Ol' school
What do the plugs look like?
Pic's always help