i'm looking at a 60'' disel exmark. i dont know if i will scalp the lawns with this machine. i have been using a 36'' walk behind & 46'' ztr deck and want to add on a larger machine to my line up. i dont want to buy machine and end up hating it due to scalping. i'm maintaining about 120 half acre to acre properties and about 10 large properties (5+ acers) what do you think?