I would stay with that size tilapia. The question becomes what size forage are those tilapia producing. If they are producing over the summer 3 inch offspring then what size LMB does that help? The same ones as the TFS - small to med sized 10-14 inch LMB. If that allows more 3-4 inch BG to survive and grow to 6-8 then mission accomplished. In any situation it is key to look at the whole food web in relation to the goals.