That's fair. My initial impression is that this will be a battle of attrition type culture since you've given them multiple support units and lower damage shield unit. It seems like you expect the battle strategy to be buff and heal the shield units and let them defeat enemies via retaliation attacks. This might work on AI, but it seems very easy to disrupt as a human player. But we'll see, maybe I've got it all wrong.
Selfishly, I do wish you had gone for (potentially) non-astral battle mages, though.... battle mages need more love...