Typical John Deere

Try a set of Oregon Gator blades. There are sometimes variations in grades through their Fusion lines. Put your Deere blade part number in here. Note that Deere offers a 3n1, mulcher and high lift version

http://www.oregonproducts.com/lookups/powersearch.aspx

http://jdpc.deere.com/jdpc/servlet/com.deere.u90490.partscatalog.view.servlets.HomePageServlet_Alt

The jd mower cuts best with the blades slightly lower in front than rear. It also mulches better than some others, and that means a slow speed, it is the main reason to have that deck IMO. Those terrain wheels on the front are meant to be used. If the deck is not low enough, it will not flow air right and the cut will be rougher than if its lower. JD also sells a leveler gauge for 5-6 bucks to help you dial it in really well.