I tried mine for the first time last night and also hit a limit too low. I kept the PCB warm by mounting a waterblock on the back of the PCB on top of 2 layers of liquid electrical tape and a thermal pad for better heat/cold transfer. Then I put my rads in front of the kerosene heater and the water temps got up to around 70C. Only had to hit it with the hair dryer ever 5 minutes or so....full pot for about 2 hours.

But, it didn't help my clocks Similar to Allens results, had stability troubles past 1150 (only tried +250 to +350 on the core). memory would not clock past 2100....Just my first go though, I'll try again later

(I'll post up some pics of the water block later)