One thing you could do, is loose the rings and use glue dots on your palm. This would allow you to get the card to stick easier and would allow you have your hand in a more relaxed position after the penetration.
Also, it takes a long time from the begging to the end of the effect. An effect like this should happen quickly and more openly.
Last thing, is that at the point of the effect where the spectator will be trying to see if you place an extra card under the glass, you make a big motion with the deck under the glass and also the deck changes it shape, so that it's kind of spread. So try and keep that under control and do your "move" when there's no heat on it.
Here's a card through glass table that I played with a while ago it's been updated since but it might give some food for thought.
Card through glass table 1 Click Here Also, you should find Cesar Alonsos handling of this plot too, it's beautiful and requires no gimmicks, it's essentially the same as yours but it has some nuances which turn it into something special.
Hope you don't find anything I've said offensive man and I hope this has helped you out.
Lloyd
