The details are in this thread here, along with the programming settings I use:
http://www.primalrights.com/forum/viewforum.php?f=12

The short of it is, block off the entire opening in the dispensing tube with the exception of the half-circle left at the front. This, combined with the reprogramming I did and the mcdonalds straw seem to have all but eliminated my over-throw problem with this dispenser.

I have not noticed any performance penalty, and my over-all time has been reduced dramatically. No more re-charging the pan every 5th-10th charge!