Healing Spray Bugged?

I've tried to change all of it's regular art and spell effects, but it doesn't seem to change the projectiles that Healing Spray gives. Did I miss something? Or, do I need to use a moving projectile in order for them to work?

Sometimes you can screw something like this up by not using a model that has the right animations for the job. Find out what animations the Spray missile has, and use a model that has those.

Although, in this case, I suspect it's just using "stand", which a lot of models have, so I reckon that's unlikely to be your problem.