Mowing this season for residential customers and noticed that my 36" WB Metro doesn't cut as low as say, a 21" mower. By this I mean, I can scalp at the beginning of the season the Bermuda with my 21" but not with the Exmark. I know how to adjust heights. I have all 4 spacers between the blade and spindles. Also have the casters as low as possible without increasing the "rake" of the blades too much. From the factory, my Exmark came with the rear axle adjusted to a certain height, ( I think hole D) for those familiar with the Metro. It is a major pain in the rear to adjust the height by the rear axle. Do I leave it at the factory setting or take it to the service center and adjust this? Do any of you W/B owners adjust the rear axle height frequently? Leave at the factory setting or adjust one time and leave it alone? Guru.