I am finding that I am compacting the soil,and creating ruts in which the grass will not grow. This is happening on the edges where I do my 3 "border" mows before I mow the actual lawn. It is not so severe on the third swipe but the first one, especially near my neighbors fence is horrible. How do you guys avoid this, or cure this? Should I walk around with a pitch fork and manually aerate these areas every so often?