The problem is your thinking about it too much :-)
You can tune so many ways... Tune the injectors for 0 trim for ol target or in the middle. Put 850 start the car. If it says it's taking out 15 points just go to the maf table. Select all and press the minus button 10 times, restart and try again. When you get the idle set that way I t should be pretty close on the ol table.
Ol is just an additive that should hit the target afr in that table... Nothing to worry about if you have 10.5 and it hits 11.5.. The Ecuflash guys and romraider guys just made it target afr to make it easier for people to interpret.
Send me a pm if you have more questions.