Remove the smaller bass. Any short bass or skinny bass needs to go. You may want to consider having the lake electroshocked to make sure that the bluegill really are gone. If the bluegill are in bad shape you have many options on how to get the forage base up again. In all honesty 100 large bluegill won't be enough with 6lb bass roaming the water, I would expect you will need closer to 600-700 if not more in the event the bluegill are gone.