Plug and piston wash question.

Do these look okay?
Left one is front cylinder with most of the piston cleaned on top. (Not grey clean just not a lot of carbon)
Right plug (rear). Looks perfect and has perfect piston wash.
I’m a little confused why it looks lean but piston looks rich.
4-5 hours on these plugs
96 Superjet 700ft above sea level
B pipe
Flame arrestors
Jetted per Factory pipe.

Little gurgle mid range when steady throttle then 2 quick blips and cleans out.

Possible just pop off in front carb?
 

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