I doubt you're far off. I unlocked Power Catalyst at 2120 Psychotropy, and at the time I had about 1.5k biotropy and about 1k concentration. The other skills (bravado/serendipity especially) seem to make a difference, but I didn't record those skills at the time (couple of months back).
Plus I think it has quite possibly changed since the VU... quite a lot of mindforce stuff changed including the skill gain rate. I get quite a bit of Power Cat still, but definitely not as often as before the VU... maybe it's my imagination!