I didn't get the exhaust temps during the dyno runs... didn't have time to get the mychron out of my uncles car.
I plan on getting a few rev runs in the garage with the different plugs and different timing, and see about temps.
I am running a pacesetter header into 2.5" through a Summit straight-thru muffler(where the Cat used to be), and then 2.25 pipe the rest of the way back.
MAF is good, Injen intake, no leaks anywhere
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If you really have 2K degree exhaust your header will be cherry red - very clearly noticable.

I've forgotten, did you check the other runners? How do they compare?