Well, for the moment I have gone back to the fctory coil packs under advisement from my tuner.
The Bosch coils seemed to be running fine, although I did have to gap the plugs to .6
I installed a powerFC and took it to get tuned. The tuner insisted on using Denso Iridiums, so I went with his advice. He says he has tuned 20+ skylines with the factory coil packs and NEVER had a problem.
Soooo he started tuning with the Bosch coils and the Denso's gapped at .8 but couldn't run any more than 1 bar and it was still breaking down on full throttle. It would rev cleanly to redline under half/three quarter throttle, but on WOT it would still crap itself.
I needed the car back (daily driver) so he had to stop there, but he suggested I go back to the factory coils and see if the miss disappeared. I did so, and with the same plugs and gap the miss improved was wasn't completely gone.
I swapped the plugs for a set of NGK Iridiums that I had which had only done 500k's or so, and gapped them at .6. Miss GONE at 1 Bar.
That was about 1 1/2 weeks ago and everything has been running pretty well, but I took it for a drive last night and the miss is BACK at WOT. Not as bad as with the Bosch coils but under the same types of conditions.
I have a pretty strong suspicion that there is a voltage drop or an earth leak under heavy load, so I'm going to give it back to the tuner and see what he can find.
I am still in denial.........