I did mention the name was a Place Holder until someone came in with a better one. As for the speed I though about it and it would be pretty useless as a troop of it didn't do its job. As the healer always heals this unit should always buff nearby troops. You can't control where he goes and plus he does have health to worry about and will eventually be taken out by splash damage because he doesn't stick back like the healer.
If it would suffice you, I had planned to modify the damage boost he gives which is what we really should be concerned with because the reason you want him to be slower is so he doesn't constantly rage troops. So I'll add a additional different set of damage boosts to see what people like. I do agree the original set does seem Over powered.

