Brian, you need to install some guages so we can find out what is going on in there!
You also know my notes on this as well. Ever since the weather got colder, I've been running lean at over 5000 rpm at WOT. Even with using 35% enrichment using an SAFC its still running lean. I'm actualy afraid to run any more correction for fear that I may lock up the injectors. I've also had to enrich the entire rev band from 5 to 20% just to stay out of the lean side of the a/f meter.
The only plus side is the extra gob of power from idle to 5000 rpm. Then the power drops off.