Par for the course in "Bitcoin miner vendor land" I am afraid...

I will take it apart and "reengineer" the cooler to see if that gets me anywhere. I might just need to give a 1/4 turn more on the nuts... We shall see...
cgminer varies according to the pool (and interestingly, per share diff) I get 800+GH/s from cgminer but ~580GH/s at Eligius and ~580 GH/s from cgminer and ~580GH/s from slush...
Thanks!