Well, that's what I did add: a TFC Exchanger 360 rad....it sure dropped my load temps from 52-53C to 45-46C with just 1 FZE.
The GTZ or Luna don't differ that much from eachother if u look at the price. Still like to know if a different block like the Luna or GTZ will give better results
Try a random block. I went for the cheapest ones first but I'm sure a Heatkiller v3.0 or Koolance 350AT would be better. I cannot get the HK locally and the Koolance was twice the price of the Luna.
If you try a Heatkiller and you're not satisfied, I'll buy it back from you.
Isn't the official stance of CoolIT against radiators and yet you did it and saw an improvement.