It has more value than your post. I wasn’t suggesting He needs a 2000 pound disc I was merely stating the more weight the better. Make it as heavy as the frame will support and the tractor can pull. Adding sandbags or cinder blocks it seems it would be pretty easy to experiment and find out how much you can add before the frame starts flexing or the tractor can’t pull it.
If OP can’t pull it with enough weight on it to do some good then try making the disc narrower by removing the outside discs Or maybe sell it and buy a narrower unit and adding weight to it. How well a disc performs is directly related to the weight per disc.
I have nothing against compact tractors I used to own a tiny
BX23S but when it comes to tillage there is simple physics involved. It takes all my 73 HP to pull my 7’6” disc. Works out to about 10 hp per foot. Equivalent for his HP is a 3’6” disc. When it comes to tillage if you have a smaller tractor one needs to realize that they are going to have to use narrow implements. A compact tractor can do pretty much anything a full size farm tractor can you just have to realize it will be just a few feet at a time instead of 20 or 30.
Many of the implements marketed towards compact owners sort of anger me because they are just too light to do any good. I have owned a variety of smaller tractors over the years and the typical farm store discs and they are basically useless. People plop down their hard earned money and wind up with something that will disappoint them. They are not cheap but on smaller tractors I have found rototillers to be the best in terms of getting tillage done with limited HP.