We cannot simply add 2000 lbs. Ballast Total Displacement 7,500 lbs. So 2000 lbs. What is more, a larger motor will be needed as well as larger spars, more sail, etc. All this is more weight.
More weight means more ballast and so on.
But if we deduct 1500 lbs. Boat Less Ballast Ballast Total Displacement Ratio 7,500 lbs. The stability curves show you clearly. The character of the curve is the same, the range of stability is the same, only the amount of power is different. The smaller sailplan is easier to handle and less expensive.