I've played around with the stripper plate gaps and corn head speed. Neither seemed to make much difference. I'm back to my original guess that my new GVl plastic hoods are the culprits. I'm thinkin' the end of an ear can get in the opening just above the top sprocket for the gathering chain. As the chain comes around, it breaks off the end of the ear, and the broken end goes under the hood and onto the ground. looks like I'll be modifying these hoods for next year.