Maybe rather than the skill dive, change it to "lash" cost. That way it doesn't need to fly for more damage. Also dive is usually associated with air creatures.
there is one air creature with dive and one light creature with dive. I don't see the association between dive and Air.
Also, a creature does not need to fly in order to use dive, you can see that if you web a creature with dive, and on mutants with dive but no airborne.