Yep, what Johnd and gotturbos said, I have a turbonetics 60 series, HKS 264's, tial44, HKS AFPR, 440's, walbro, SAFC II, DM FMIC and I have the same lean spot but more at 2800 to 3000 rpm. I doubt the 550's will take it all away but it might help some.
You can use your AFPR and Piggyback to get...