If your anywhere near Ft Dodge IA the Gleaner guys swear by this outfit for re-setting their Gleaner pumps for better combine performance. Midwest Diesel Injection Service, 2773 200th St, Ft. Dodge, IA 50501 Ph: (515) 576-5501
Michael at Diesel Equipment Specialists can help you out. He's in Salina, KS @ 1-800-456-3374. It is not uncommon at all for the pumps on the new combines to need adjusted. Get it done now under warranty.
Before resetting the pump have you dealer check a couple of things. As this is an emission engine make sure that high idle is on spec. Don't remember for sure what it is, but it must be there. Second make sure the throttle cable is adjusted to see at least one mark on the throttle capsule to ensure that the pump is at full throttle setting. If this doesn't help check boost pressure both at manifold and aneroid and fuel transfer pump pressure to the injection pump. I am assuming here that you have changed all the fuel filters. Might also check the fuel tank vent and make sure it is not restricted.