cgminer sorted out.

vcore was way up at 0.78v (meter designed for MUCH higher voltages and currents; only reads to two decimals; first I've ever seen decimals on it - don't usually worry about them when dealing with 6kvAC or 300vDC). Dialed the pot down and was gratified to see the voltage drop. Settled on 0.60v at 150MHz, 8.1-ish GH/s 0HWerr. The heat sink is still too hot to touch for more than 15 or 20 seconds, but I have heat sensitive fingers. I don't have a reliable way to measure the temp but I feel comfortable leaving it here for passive cooling. I'm still hoping moving it to hub with known power ratings will help.