Anyway, MP refresh is just one small problem in the Astrologians gameplay.
the real problem is that AST is not (at the moment) comparable with SCH and WHM in healing potency:
-collective unconscious is a nerfed version of sacred soil/asylum
-lightspeed is a nerfed version of presence of mind (of course you're faster then a whm with pom but ... -25% is just too much)
-aspected benefic is a nerfed version of adloquium (in nocturnal sect)
-aspected helios is a nerfed version of medica2 (but similar to succor)