1512 2.5D vs 3D on 5S?

[DRIFT_BUGGY]

Tried the 12T pinion today and medium settings and no good, temp went up to 180F again, then tried it with the 11T pinion and back to low timing, no good temp went to 190F. Has to be something in the drivetrain somewhere. Going to have to strip the whole thing down and check. Before I changed to the new firmware on the MMM and no longer run the ext bec and also changed the diff fluids (5/10/2 to 7/10/3) the motor was running 165F on 13T. I do remember though that I had to rebuild the center diff becuase it was leaking and when I opened the diff there was a washer/shim on the oring and seemed to be the reason why as the washer wore out the oring and I checked the Losi manual and they didn't mention nothing about a washer