Lol for 59$ per risers? That's way too costly for just a riser, I'm actually using the 006 risers here and I don't see any hot on the sata cable, maybe this have something to do with the way you connect the power? Are you using double power supply?
Each set comes with (6) of the following:
1x GPURisers.com Branded PCI-E Riser Board
1x PCI-E Chip
1x USB 3.0 Cord
It's 6 riser + usb cord for 59$... not 59$ per riser
Still twice the price of your average "chinese work as good as more pricey" riser