I have a JD 757 with a mulch kit and the JD mulching blades. My personal lawn is about 600' by 100' with a driveway down the middle so I have two 600' by about 50' sections. It is mostly common bermuda with some 419 close to my house.It is much easier to mow going the long direction, so that is what I do mostly. About 2-3 days after mowing (currently @ 1.75") you can see lines where seedheads are much more abundant. These strips are right where the tires ran on the last cut. The blade are sharp. Is the weight of the mower stressing the grass under the tires and causing it to seed out faster? Is the center section getting a better cut? The deck is level side to side and about 1/4" lower in the front. My bermuda seems to be seeding out faster than ever this year.