well, just because it doesn't fit with the usual, doesn't make it a bad thing. your specialization should be in alteration for 2 reasons. 1 canni. 2. heals.
both canni and heals are alteration based, and therefore, our specialized areas and skills make it more beneficial to be alteration than conjuration or evocation.
I'm not flaming you, but a majority of shaman specialize in Alteration, so it is better for more people that it is alteration.