Instead of cutting your dip tube, attach about 4 inches of flex tubing to the end of your dip tube so it lays on the bottom and makes a U turn about 1 inch above the bottom.
When you transfer your beer you will leave 1 inch at the bottom without scattering the sediment into solution. Assuming you are using a Corny keg as a secondary, put the flex tubing on the dip tube when you first transfer the beer into your secondary keg.