Cleaned my transmission ground strap today because...well, because I hadn't yet and figured I might as well.
The car seems to run a bit nicer and specifically the idle seems more stable.
Most interestingly though, my digital CHT gauge is showing my head temps are ~25 degrees lower! I don't believe I'm actually suddenly running cooler. I think I was running that cool all along but all the gunk on the ground strap was giving the spark plug temp sensors a higher resistance to ground and thus giving a higher temp reading.
I thought I was doing great running in the 320's on #3. I'm now running in the 290's-300's! Hot damn! That's cool!