Hello, I need some feed back. We have a new HPS Lesco Unit and found it to be very slow in the app. speed ( 3.5mph - maybe ). Since buying it this spring we have discovered cub cadet bought the rights and is selling the same unit but it is rated at (5mph) forward speed. What is the difference? unit looks the same, motor is the same. Maybe I have been spoiled with our Permagreens. Looking for drop in spray unit. Any suggestions?