Most cases prove to be more complex, but I'd say it's safe to say too many LMB were removed in that 8-14" range. If the CNBG/BG are left to roam freely in unlimited numbers they are going to wreak LMB reproduction via egg stealers and feeding on freshly hatched LMB fry.
Beings this is way out of my area I'm not accustomed to the stocking rates used in the SE so I'll refrain from futher comment other than it appears your predator base is lacking.
