couple of points to echo bmat:-
its called a retention vanish because its done slowly after its done bring the hand over the dirty hand and give it a couple of taps,one hot one cold, (add groans were apropiate) this will give you adaquate cover to palm the coin and place this one spider vanish wise on the table, you will then need to move your clenched hand out of the way so your dirty hand can pick up the glass which will be seen to be empty because it just had the clenched hand resting ontop of it.
if you replicate this idea with the okito penetration any odd movement seen after the retrention will be dimissed as you getting into a snooker type hand stand.
why not put the jumbo in your back pocket or waist band, its perfectly natural to place a coin into your pocket and then place your hand behind your back to demostrate your not doing anything sneaky with that hand.
han pin chan moves are always odd but are rarely noticed by a spec who is following what is expected to happen so are not looking in the wrong place so definatly magicians guilt there, personaly for the second coin I prefer the click vanish sometimes called a click pass rather than a han ping move, thogh thease days I'm even more lasy and use a clone coin to clearly show the three and two coins before the jump, always being one ahead.