I am thinking about trading up to a BX2230 and was wondering if I should go with a 54 or 60 inch deck. Does the 60 have a tendency to scalp or clump? I have a hilly yard with some swayles here and there, lumps etc.(the yard is not golf course material). I have a 54 on a smaller BX now and it seems to work ok. How well does the 60 work with a bagger set up? Would it be a mistake to buy the 54 for the larger machine?