Can you send pictures? I have cut horse pastures at two locations over the past 23 or so years and have never seen an issue of build up that would concern me. My brush cutters turn counter clockwise so you are supposed to drive clockwise when mowing. In really thick stuff it might windrow a bit on the left but that dries out in a week and is not an issue. I do not cut when the ground is soaking wet either so I do not seem to leave tire tracks except for fast turns where the front tires might scratch the grass.