I think Jay is right.you need to put the heads on, torque them and then once you reach the final torque specs, walk away for 3 or 4 hours and then come back and retorque them again. Retorqueing after a heat cycle is not necessary.
I installed my heads on the stand, multi-step sequence. Came back several days later and re-torqued on the stand
After a few heat cycles on the car, I again re-torqued and the nuts did not move. Click click every time.....
This was with GN1's and Cometics w/ copper spray.