The meditations I've done are the ones on the JoS. I just kept at it, working on chakras, the Veil of Isis mantra (EE-SS-EE-SS) HPS Maxine wrote in the yahoo groups, INANNA, trance. But make sure to never fry yourself, you can go in cycles and not constantly. I took time off from empowerment meditations and my senses developed further from focusing more on cleaning.
Don't push yourself too hard, but be consistent, at least in cycles. Like 90 days of a mantra to open psychic senses, then some time off, then do it again. That's how I did it.
Another thing I feel was useful, is working with colors. Breathing the colors into each chakra, seeing the colors. This gives practice with astral sight.