Very Nice. I will go back to my R1 once I have the Compac sorted. Which resistor did you change on the Compac to up the Vcore Voltage?
The onboard 10k pot goes from ground in chain with a
~10k resistor to the TPS51219 voltage regulator.
alle what you have to do is to remove the 10k res and replace it with a 17k or 20k resistor

.
Here a pic, which resistor you have to remove/replace:

One thing I am finding with the Compac is that it seems a bit fussy about starting hashing, sometimes have to go through multiple plugs & unplugs and restarts of cgminer. However once it's going will run for days without a hitch.
Rich
Same things happens to me

!!
The problem seem to be, that vcore drops down for a moment after starting cgminer...
In the most cases, the vcore vary after start and than it goes to zero.
I have to plug out and in, and fiddle around with the vcore value and after a lot of unplugs an replugs
it begins to hash.
But when it runs, than it´s perfect, stable and w/o any probs!
No zombie or other issues...
Little Hint: to prevent overheating of TPS 51219, I've added an small Alu-Cooler on the backside.

andY