Holley/Demon Carb stumble

Yes running a power valve, like i said theses plugs are well over a year old(Probably longer) and not a clean cut plug.
I know my idle and "tip in" is way rich.....ah well i really think so.
I finally got my o2 meter reading and it was showing 12.0 to 11 air fuel ratio threw all three gears.........

I will be buying some new plugs for the next race and a couple of spares to boot, for testing. hope to have the idle circuit/ tip in sorted out by then.
The problem with reading a spark plug after a full hit. Is that i have a reverse manual shift valve body so i have to slow down a lot before i can get it into neutral and kill it. still have the factory slap stick, that is worthless because of the reverse valve body.
I'm guessing the oil deposit was from all the lean banging (Lifting oil of the ring..?
Like i said the plugs are old and the idle circuit could be what is being seen on the plug.
Normally the ceramic is bone white. it looked different so i posted up a couple pics However i usually put a fresh plug in before i check the burn. This time i did just because i haven't pull plug for a long while.