I guess the question is do you want it repeatable running clean or not.

I know one car that ran spot on time, run after run, was only launching at about 10.7-11:1 AF. Just a tad rich. WOT was perfect. Think that is a good situation. Even if it is, is that acceptable?

Once the rich condition was addressed, the car launched even more consistently and picked up 60'. Still ran lap after lap on slightly better number. Any drawback there?

I bet the engine will last longer too not having to huff through that pig rich area waiting on the lights.