Merger pickup feeding poorly

We picked up a Gehl 1150 front mounted merger this summer for making haylage.  It's great for harvesting lighter crops faster and even for heavy crops as it allows you to take two swaths to the back and one to the front for example.  This way you can always be full at the front, saving time for the guy hauling wagons.  For haylage, we typically lay a 5' swath (10' discbine) and then harvest it without raking to minimize leaf loss and stones.

 

Anyways, the pickup teeth on the merger are bad for pulling hay partially down into the slots at the back.  This causes it to feed poorly onto the belt resulting in a pretty lumpy swath that occasionally will stop the harvester pickup.  The harvester pickup doesn't have this problem.  My brother added some pieces of plastic to close the slots off as much as possible but it didn't seem to make much difference.

 

Has anyone else had this problem and what did you do about it?

 

Thanks!

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Merger pickup feeding poorly