Take a look at Gator blades for mulching. They cut clippings into small pieces so you don't have so many "clumps" to deal with. Do yourself a favor and have more than one spare set. Get them sharpened by your dealer frequently. Guys on here will tell you as often as every 10 hours of cutting; I'm having mine done every 40 hours, sooner if I find nicks or burs.