I have a 1065 New Holland self-propelled bale wagon. As I am driving through the field, the front tier falls forward onto the lift table. I have to drive slowly and not apply the brakes to keep this from happening. I have adjusted the cage and the tines on the rolling racks several times. I have tried installing the flex tines on the sides of the cage, but they prevent the bales from stacking correctly if the cage is adjusted too tight and if the cage is too loose, the stack is not tight. Is there any mechanical method to keep that tier from falling forward? My pickup rates are extremely slow at about 72 bales per hour for an inexperienced operator to about 45 minutes for an experienced operator.