(B) . I am using the booster and G3x and VPX. Yes the speed of the trim is dependent on aircraft speed but this is done via g3x. The g3x has a page that you setup with trim motor speed percent and IAS. I have no idea how g3x does this but guessing it’s sending intermittent signal? Makes trim really smooth when going “fast” The booster is also suppose to have stuck trim feature? I don’t recall them being that expensive and seems worth it for less brain damage.