I have one with the 48" deck and I love it. The salesman said the larger deck was not designed as well as the 48, and at the time a bagger was not available for your size, so I purchased the 48. I'm sure the density of the grass matters as well. True, if the grass is wet or abnormally high +1.5" above cut (my lawn) it will clump up. Generally, in my dense grass I get some leftovers but it doesn't bother me. I keep mine on almost all year and sharpen them about 2- 3 X a season. I use to bag my grass and leaves, but now I do not. The mulcher works excellent on dry and wet leaves, although it works best on the dry stuff -very dirty though. I would recommend the mulcher to anyone, although I am not sure about your's. When I was deciding to by my mulcher the Sears salesman said try it and bring it back if you do not like it. I had the early model without the 4 wheels and center roller and I specifically asked the salesman about scalping issues and the need for extra wheels and a center roller- would it be out the following year? He said no, but it was and Sears gave me a new mower after 1 year of use. Hope this helps.