To quote myself (APUG thread):
"I have not found a dilution/time combination for Tech Pan in Pyrocat-HD that I like for general purpose photography. I seem to either end up with too dense and too contrasty or not dense enough - and have not found a middle ground yet. Earlier (on another APUG thread), I posted some of densitometry results with TP development experiments.
I have been shooting Tech Pan for many years (35mm, 120 Roll, 70mm roll and 4x5). I have tried a lot of developers and my all time favorite is Bill Anneman's Perfection Micrograin - which is no longer commercially available."
(there was a url link here which no longer exists)