Here i am disagreeing with most of the answers, i also run a 4.1 toilet bowl, but with a DSR pump. The milking does not come from the top end it comes from the startup and warmup/driving to the line. I warm the car up with the pump shutoff 1/2 open and try to get the temp up to 185 degrees before i reach the starting line. I donot run a highspeed leanout, but i'm sure if i did i could run better. Bottomline with a ron's injection you will milk the oil no matter what you do.
I run with 18 percent leakdown and depending on the weather and temp. .085 to .100 return jet.
It's just what i run and my experience.
Zip.