For your PSU wise, are you using the yellow +12V line from the 4pin molex (SATA/IDE) cable?
I did not use the +12V wire from the SATA/IDE cable, just the 4-pin cpu power and 6-pin pci-e cables.
If the main PCI ATX or PCI-E +12V lines are getting to the point you can't touch, you may want to check if your PSU is strong enough to support it, or if there is too much resistance on the line for whatever the reasons.
They're not that hot that I can't touch them, but they do feel hot to the touch.
The lines from the AntMiner I'm running doesn't get hot at all and it's on the 450W PSU with +12V from PCI-E and PCI ATX lines. (1 Line I double up the cable for both Yellow and Black just to be sure/safe because I want to let it run without attending the unit everyday.)
That makes 16 cables (8 yellow/8 black). I have 10 (6 on the first blade and 4 on the second), maybe that's the difference. The bottom of the PSU is getting hot as well, so maybe it's not powerful enough as you suggest. I'll see if it gets hotter with time, if it does I'll definitely get a new one. It will run unattended most of the time so I'd like to be sure it's safe.