Something I noticed this morning doing a 2-3-4 pull. My AFR was 11.0-11.2 in 3rd gear and reached 178kpa on the MAP at the top of 3rd. In 4th gear it was 10.7-10.8 and the MAP was only 165kpa. Boost was basically a flat line from 6000-6800 in 4th. I was between 160-165kpa in that range and was a very gentle slope up to 165kpa. Is it that the blower is maxed out and that's all she's got in her? Since it's less boost in 4th gear does that explain why 4th was richer? I'm driving the blower 10% past rated impeller speed.