m olofson wrote:

I just purchased a new Toro Recycler yesterday. After mowing(mulching)
I find the grass height to be very uneven. I have tried going slow and
this has not helped. I am overlapping quite a bit and this has still
not corrected the problem.

I can't tell you what the problem might be, but I can report that the
same self-propelled Toro Recycler cuts my grass very evenly here.
Perhaps there's something wrong with the unit that you received?

Have you set all four wheels to the same height? That could be an issue.