I don't think his pipe routing is the issue.
Have a look at this thread jeff:
http://forums.hybridz.org/showthread.php?t=133438&highlight=IAT
If i had to look for any one marker, i'd look at the size of that intercooler. CFD analysis on that type of intercooler has shown it will recycle hot air across the 1st few rows without proper inside ducting. I think that may be what is happening to you.
The readings for the mild steel piped car in the linked thread above are from the GM IAT sensor being mounted in the intake manifold, right where the cold start injector use to be.
By my groups standards, that mild steel car runs too hot all the time, and picks up too much heat under boost. It still is clocking in at least 10 degree's cooler than your car under full tilt boogie.
Given the shape of your intercooler, i could see air pouring around it, as opposed to the other thread where at least for the 2 cars i tested, the intercoolers are 12x24x3" cores that are snugged up right against the face of the core support to create a big heat exchange sandwhich with the radiator.
Moving it down into the airstream a bit could help, but i believe you'll see bigger gains if you duct it out about 6" or so, basically a big retainer wall to keep the air filing through the core instead of spilling over the end tanks.
Go down to a local supply store, pick up some cheap roofing flash tin, and cut yourself up a mock up duct ram setup, take some aluminum flash tape, affix it to the intercooler, and go do some test runs logging. If it reduces IAT's by the end of your run, make a real one. If not, junk the idea and start considering a larger IC or Meth/Alky injection.