Airhoverfactor is a tag used to control how much a ship wiggles when it's in dontland mode. It works only two thirds right now... It controls how quickly a unit will wiggle on the X and Z axes (left, right, back, forward) but not on the Y axis (up/down)... I think it's probably a simple typo, since it works for the other parts perfectly.
As it is, the only way to reduce the kinda ridiculous amount gunships wobble up and down is by reducing their acceleration dramatically.
Disclaimer: I'm usually wrong about everything.
