Air in the cooling system maybe?
Definitely not. I have clear lines so I would see any air. Plus I purged it all when I re-ran the lines on that board.
I'm going to take a straightedge and my feeler gauges to it as soon as the liquidpro comes in. I'm willing to bet the chips don't sit straight so sometimes I get lucky and they cool properly but most of the time they do not. That's probably why LiquidPro works so well for people. Until then I will deal with it because I'm getting tired of taking it apart every night. I will post my updated results as soon as my shipment arrives.