I have a 2006 toro proline 21" with the kawasaki engine and no BBC. This unit is good except for the height adjusters. According to the manual my unit's height adjusters should be cutting at: 1, 1.5, 2, 2.5, 3, 3.5 inches. However, at the so called 2" mark, the mower is cutting at 1.75" and scalping especially over bumpy terrain. At 2.5", the mower is cutting at 2.75" and leaving the grass shaggy, with uncut blades. In talking to other toro proline owners of 06 and newer units in my area, quite a few seem to have the same issues. I contacted toro and usual, they say nothing is wrong and that there's nothing they can do about it. They did say that the changed the height adjusters from 2006. I've owned 3 toro prolines in the last 10 years and never had this issue. Any suggestions as to what I can do to correct this problem, beyond selling the unit and going for a new one?