I have had mostly successful transports with the KA60 (both models) but still get the up and down thing and ejecting from time to time... as far as I've tried (an eject/bail out function would help here),
I cant get out when its bobbing and cant unstick from the MH-9 bench through movement or reselecting the get out option.
also the AI seem to enjoy letting you out over water due to lack of "suitable locations". which would be fine if the AI would not try turning the heli into a submarine or if I could have team bail out before it happened. though when I play as a diver the ability to do that seems a great way to insert if I told it drop over water.