I am impressed with the ability of my compact but the box blade my dealer said i absolutely had to have seems to be a bit heavy do they have smaller one
John Deere 4052R Cab,, Deere 855D UTV, Z920A Zero Turn Mower and assorted implements
I answered your PM.
You'll want a 60" box blade on your 3005 unless your soil is loose and pretty much free of rocks. Might also be you're trying to dig in too much for one pass.
Read my PM response for more info...
Are your tires loaded with liquid ballast? Do you have ag's or bar tires? Do you drag the BB in 4x4 mode?? What kind of terrain/material are you working with? All that makes a difference, but as Roy suggested, maybe you are taking "bites" that are too big at one time? One can probably stall out and make just about any CUT spin the tires with a well made heavy duty BB that is full of material. So maybe you need to adjust your expectations and stay within the limits of your tractor and BB?