For a gear based walk behind what gear do you guys usually run (1 - 5). I have an 48" Exmark Metro and I find that if I run in 3rd gear with the side discharge open (no bagging) I'm not cutting all the grass. Some of the blades are not cut. My lawn is pretty thick and I cut it pretty frequently. 2nd gear seems to work fine. I'm running high lift blades and I keep the under side of my deck very clean (I use Fluid Film). Any suggestions?