Tom,
I am at about the same place as you on hp/tq and hitting 12.0-11.96. The only differences I see in our mods is I have stock mani's with the 240 mod, a 181 pulley and NW Dual CAI. I have been using Iridium one stage colder plugs for quite some time though. But that cant be that much difference....if any.

Do your data logs show any timing being pulled or anything? I think I am loosing a little after the 1000' mark. I have to get my Dashdaq put in and connected to my Zeitronix this weekend so I can log and see what is happening.