Well, Heart of Angel is a pretty easy Mag Cell to use. The Mag just has to be level 100+, and equipped to a non-droid.
For High-Mind, maybe try this:
Maximum Single Stat Mags: http://www.pso-world.com/sections.ph...cle&artid=1026
Follow the guide, but once the Mag gets to 100, use the Heart of Angel. Then, you can easily feed it 200 with lots of Mind.
I'm not real sure if that will work okay, so maybe just poke around with Mag Farmer until you can get a Mag to 100 with as much Mind as possible, then use the Heart of Angel. After that, it'll be a snap; Mag Cell Mags feed amazingly well.