I took it totally out of the case yesterday and today noticed one of the copper fins on the upper heatsink was hung up on the corner screw.  That prevented the heatsink from forming a tight, flush union with the 2 chips (may have happened during shipment).  I bent the fin out of the way (yeah I should take a pic) and now the heatsink can free-float on the chips, as designed.  It runs a degree or 2 cooler now.