Scott,
Here is a picture of one of the drive cog wheels on the dozer. Did you simply bevel the inside surface, starting at the cup and making it pointed toward the points. Sort of trying to get the cogs to slice or cut the dirt when it comes into the driver? Also, do I want the cup to be more narrow so that there is not so much surface to trap something in the cup between it and the tread?
I had a thought, don't know how well it would work out. What about putting little pieces of low density foam into each square hole of the track chain so debris can not get in?
Jim