If I drop the pick it is in the first 15 min of warm up after that sweat helps them stick better and the hand relaxes enough to grip it properly.

If you drop the picks constantly it is most likely due to the:
1. too much sweat (you can fix that with some powder or just relax)
2. your technique might not be proper for your custom pick (try to change your attack angle or try many different regular picks, try a bass pick-large triangle ones)
3. you need to relax your picking/strumming hand a bit (play from the wrist rather from the elbow)

Hope that helps

Have a look here..... http://www.v-picks.com/picks

riley, if its gripping bothering you, DEFINITELY try v picks, they're smooth and clear yet they grip better than sand paper........ i can actually get them stuck to my thumb at a 90 degree angle!

Na its not the grip (well particlly), but cause of my dystonia in my right hand.

sorry, but whats dystonia?