How do you guys aproach the small hills/bumps in the lawn that you KNOW are going to scalp? I have one account that has a small drainage swail, almost like a berm across the middle of the yard. Even at the highest setting my 44" mower will scalp a little. So, I have been going around it and cutting the top with my 21". It does work, but it takes some extra time to get out to the trailer, walk back, etc. Is there a better way? Should I use the string trimmer since I will be out there with it anyway?