Actually I think cutting height is off and probably pitch also. I have had mowers that size scalp more than they should be. I checked those things, found out was cutting 1/2" shorter than setting and wasn't pitched enough. Fixed it and it was way better. I am no expert but cutting at 3"+ you shouldn't be scalping unless you are just mowing really really uneven stuff.
I would check those things before going to trouble of putting on scalp wheels.
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