Plug read, opinions needed

That grey is most likely exhaust gas. Restrictive exhaust or too much overlap?

To be honest in my opinion that second one is very good. What the spark plug tells you is the mixture AFR and quality of the mixture at time of ignition. Just because you give the cylinder a certain AFR doesn't mean that's what it is at the plug at time of ignition. Timing mark is myth.

Good to see people actually reading plugs instead of just an O2 gauge.