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.

Turn the data logger on and go for a drive. Come back and view the data log on your computer. That is what is great about EFI tuning. You just review the drive on the computer and see if it is too lean or too rich or whatever.