best AFR gauge setup

None. Go with your lap times and spark plug readings. Spark plugs will also reveal if there's light detonation.
The engine may make best power anywhere from high 11s to mid 13s depending on the engine and the load.
Seriously, I think your driving in too transient of situation even at a T&T.
Even with logging its really difficult to make good use of the data from a road race. I don't see a roundy round being much different