Maybe the power shouldn't be a multiplier but instead be additive?
I'm not near my books but if you add its force to your agility or even just to the raw meters/turn total that might work a bit better?
That would make it much better, yes, and make it less imbalanced for it to be used on a team without a domain.
- Spirits: Multiplier
- People: Addition for Agility-based movement
- Vehicles: ... Too complicated outside domain, perhaps? So only in aspected domain (hello traditions their home areas and free spirits!), and +/- F/4 on Speed if using core vehicle speed rules?_?