It does a good job with the Regen. The thing is I remember farming very well with Fire/Psi way back when the ideal map was the TV farm, and half the enemies there were Nemesis which are far from ideal PS fodder. The only times I can recall dying is when I had a network flap, or screwed up somehow. This is prior to incarnates, APP proliferation, the KB to KD IO for bonfire, and granted the PS nerf.
All that said I think it’s important to focus on a farm where the max group size doesn’t exceed 16, so that means no roamers. I’m thinking of shooting for the council empire mission as my farm. As said already, control is our defense and that’s what we should build around.