550000 serial number series. The trim side is a quarter inch lower than the discharge. All pins are in the proper places. The tires are all at 17 lbs. The front tires are both the same circumference . The rear tires are both the same circumference. Blade tips measure the same to the top of the deck. The blades have 2 hours on them and are not bent. The rear support pins both measure the recommended 6 7/8inches. I haven't pulled the rollers off to drop the deck onto a flat surface yet, but I am the only one who has operated the mower and see no way it might be bent. It is not cutting very well, and sometimes requires triple cutting at a very low speed just to come across as something I can sell to my customers. Any suggestions?