I agree on the fast bpm's "psycore" is no really trance inducing. And taking about psycore, I can find it entertaining for a while at parties but I usually get tired of being in the "death dome" (regarding the spiralling effects lot's of artist use) after 30-45 min, then it becomes "trivial" and then annoying. And yes that is simply because I really can't stay in my state of trance! It's like (just an analogue) being pulled out of my sleep just after reaching it's intoxicating effects, it really just doesn't do the trick for me in the long run! But that said I can definitely feel the psychedelic effect, but in the end I would like to avoid the feeling of bleeding out of my ears!
For darker trance, I by far prefer forest trance (scando style, what ever you want call it), and that is because it is base on hypnotic rhythms and sounds, with out the breaks every 10-15 seconds, and bpm's usually in the 145-152 range! I started listing to psy/goa/trance in the mid-nineties (not only because of that of course) so totally get the whole trance=hypnosis thing