Chainsaw Repair

I put some good run time on my rebuilt 211 and decided to pull the muffler to see how it looks. It has a couple vertical lines but nothing you could feel with a small pick. So next thing I did was a compression test with neighbors gauge, the type that has the rubber tip you press in plug hole. It looks like 130psi ( that type are difficult to hold when pulling starter). I need to get a good one.
The saw starts good, runs good, smooth response, and idles good but the plug is black like its running a little rich.
I wanted to make a little adjustment but neighbor said leave it be, it's a good running saw.
Whats your thoughts?

OK, thanks. It's just that I'm as nervous as a call girl in church with this saw. It's the first time I totally tore down and removed transfer (straight gassed) and put new piston & rings & seals.
Maybe I'm the only one who has that feeling with first rebuild, but if I do another, I've learned a bunch from this saw.