Best AFR for consistency

Way back in the day when i had only my et slips from today and yesterday and simple dial gauge, showing air pressure.
I found jetting my car on the lean side keep my et much closer from the heat of the day to the cool nights.

For two year i took Bracket Racing real seriously! First year i took 17 place and the 2nt year i took forth. I was in 2nt but chocked. (A story for another time)
How did i do this. got the car dialed in the best that i could and left it the Fing Alone. put a lock on my tool box, made notes on my et slips.

As far as were to start out with a afr... 11s! If you have one cyl that is way leaner then the rest. (actually vary Probable) then the AVERAGE of 11s will keep you save as you sneak up on "YOUR" best AFR.(ET)