I only know one coin ditch and basically it is a complete vanish and the coin is ditched in the breast pocket
That was some useful advice there.
To the OP. The idea with coin ditches is, you either do it way ahead of schedule, to be one up on your spectator, or after the reveal/effect, to use audience reaction as misdirection. I like how you were trying to be smooth with your actions, but since the timing of the ditch was at the same time as the reveal (or should I see reveal of nothing) in your hand, you are performing an unnatural hand movement with a natural one. Your retention vanish seemed decent, and your classic palm/and or finger palm looks fine, so might as well keep it there and point to your open hand where the coin has apparently vanished, maybe do a wipe away vanish, and then ditch as the audience reacts.
For another idea, since one coin routines usually are used to flow into another trick or series of effects, you can ditch the coin while going into your pocket for a pen or deck of cards, or while pretending to search for the pen that you already placed on the table.
Use real actions as cover actions for the dirty work. Don't create dirty actions for the sake of doing something dirty. What I mean is, don't go to your pocket only to ditch the coin unless you have sufficient misdirection.