I may have to create a set of psychic rules from scratch – and that has always worked out so well. See the mysticism rules for Two Fisted Risus. Basing a system on historical or literary sources is a non-starter.
Start simply. A friend, who is a gourmand, always tells me ‘it easier to add a flavor to a sauce than take away a flavor from a sauce’.
Trimming back AD&D Psionics rules is less appealing, I have a copy of a BRP conversion of those rules and have been looking them over hoping another system will help.
I have a few more PDFs to go through, however, they too are from fantasy, so I have the feeling they are just reworkings of D&D.
D&D is king for a reason.