2.5 turns out on the main needle is huge rich, I'm about 24 clicks out which from memory is about a turn or less. Regulator is about flush but that has varied a lot depending on the differnt versions of diaphragms that has been fitted over the time.

Everyone is different but I found even 12.5% oil a bit too high for my liking, needing to set the needle and reg super lean to avoid loading up and occasional misfiring. Running 10% oil I can run it richer on the needle and reg without it misfiring. I managed ~50 flights on the OEM plug before having to regap it. Symptons were it was developing an occasional misfire pushing out over loops and humpty bumps, where before I'd start to lean the needle I went straight to the plug, regapped it and misfire went away...

After a rebuild, I put up about 10 flights with a 17x13 which lets its rev out to about 8K, then swap out to my regular prop which turns at about 7.2K

I'm always learning something with this motor...

Oh and another tip, if it has loaded up with oil on the ground and the engine is inverted in the plane, try advancing the throttle to just before it starts to misfire, then pick up the plane and hold it upside down over your head. I've had to do that before to clear the oil from the tappet cover, as the rpm increases it starts to pick up oil pooling in the tappet cover, tricking you into thinking it's rich when it's actually oil fouling the plug.