I like the character, and i like seeing aspected magicians, but to me, the mechanical purpose of going aspected is to use your magicness to compliment your role. It doesn't have to always be in direct ways, but unless you do, there are a lot of opportunity costs.
Your magic now gets you a few spells, a mentor spirit, and another way to judge intentions (assensing). Thats not bad. I eould just pose comparing the build to a similar priority/stat'ed adept. You can get the same magic perks you do now and "face" better. (You can even still magic finger adept spell and simulate some control action commanding voice.) Or flipping d/c magic/meta to lose a point of edge, get free spells, astral projection, and have more magical opportunities.
I just am trying to avoid getting too caught in the weeds of being too much "magician" when aspected. IMO, it is usually best to stick to basics with most aspected magicians. Characters who can take advantage of having any magic rating (even/especially low Magic). For a sorcerer, that may be counterspelling (if combat/infiltration focused), assensing (perhaps learning psychometry eventually), spellcasting or rituals with a limited specialization of spells (you got this with manips), a focus/foci (weapon for combaty characters, a spell/sustaining focus for more spellcasting characters).
I would ask if casting f4 or f5 spells, could you get away with having a Magic of 2/3, and invest in ways to reduce drain instead (ware). Could you cobble magic dicepools higher with a mix of mentor spirit/foci/skill specs instead of Magic rating.
I think i am just wary of the rationale of having such a high Magic aspected mage when his MR is much less important to him than it would me for a full magician or adept, and can you reprioritize or reinvest karma (away from that focused concentration and into other qualities) and still have a character you like and be mechanically tighter.