when you switch back to a more normal v-pick size, it seems that your control goes way way up. These huge insanity picks are from v-picks. I think that the insanity pick forces a person to relax their picking hand, or at least makes them way more conscious of tension.
http://www.v-picks.com/picks.php
Does anyone else have any experience with the insanity pick? They have a sort of feel to them such that you don't need to regrip the pick either, which I think helps in speed.