So far I have been able to get into LB generally anywhere above 2100 rpms.
Tonight my IAT's were ~70 degrees and I was NOT able to get LB anywhere below 2400 rpm's. When I would dip below 2400 it would disengage repeatedly. This was tested during a 60 mile drive.
I will pay more attention to what my IAT's are when the car's being nice and letting me get LB at lower rpm's.
I did a tiny amount of data logging. Here's proof of exactly what the ECU is commanding for AFR's. This is directly from the ECU.