I have a 329 with a 52" rear discharge with stock blades that are kept sharpened. We have had some odd weather in East central Indiana of late, when the soil is moist, I can mow faster and not get beat to death, however when we go thru a dry spell, my predominately clay soil dries rock hard and I have to slow down or get beat to death with a terrible ride. It seems I get a better cut when the conditions allow me to mow faster. I don't know if it is in my head or not, but it seems that I get a better cut while mowing at a faster speed? Is this just an illusion or with the rear discharge is there a better vacuum at a higher speed rather than just faster than a slow crawl?