Does that head have a cam and rollers to hold the teeth out in front and then retract to release the crop at the top (like most pickups with teeth and strippers)?  Of so, look to be sure the rollers and cam are good enough to hold the teeth straight out on the front part of the tooth travel.  Years ago we bent the end 3/4" or so of each tooth a little bit forward to help "hook" the crop in the windrow (some other balers had that bend from the factory).  That helped to pull the crop into the head instead of just rolling it out front.  Don't get too carried away with the angle of bend, just a little helped.