I seem to have the same issue but not as severe. My 2 GTX 680's hover around 80 degrees with the HW fan controller. With MSI Afterburner's Software Fan Control It hovers around 72 degrees.
How my GPU's are layed out (Ya Couldn't find the proper camera @ 3am
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They are in a HAF 932 with the 230mm side fan blowing on both of them and a 120mm AP-121 blowing on the bottom card. I will be water cooling both of the cards and the CPU later this year so is there any temp fixes I could try in the mean time? Would ghetto mounting another 120mm fan with velco on the side of the HDD case help?