I had the same problem on mine, just sand it as much as you can put some good epoxy and sand it some more till everything is straight and smooth then paint it satin or silver. Finish the season and put a new lower over the winter, if you look close you can see where the skeg was welded on.
Scott

There are stress cracks on both sides and top to bottom of the cone which means your cone needs to come off and get reattached. It is loose. Start over or you will fight this every few months. There is no way for the bondo to come off (short of a hitting bottom) if the cone was not moving and causing cracks.