Tx's for that info chuddly.
Running in CL it should be in the area of stoich, approx. 14.63 for gas. WOT & Hi load conditions I would expect it to go OL with mapping as you mention 11.5-12.5....maybe not. The fuel box should let us do that & notably power gains should be had, even stock.
I agree both cylinders should run similar AFR's, had not planned to try & tune individually. My thought process is if one cylinder is normally leaner, not due to any mechanical issue's. Tune based on that.