Mine takes for ever to trim down when its on the trailer, but when its on the water its ok, as long as your'e in forward gear the thrust of the prop helps it trim in quicker. trimming out is never a problem.
theres quite a complex arrangement of relief valves in the tilt unit and the way it works means there is more hydraulic pressure involved in trimming in then just tilting in or trimming out so it will be a bit slower anyway.
i got into the habit of trimming in while still under way saves what seems like an age waiting for it to trim in when stationary,
seal could do with changing, see if your fluid is pink rather than red.
I am usually not as green as i am cabbage looking.