You can expedite things by adding advanced size forage fish. For example, you can stock 2-inch BG at regular numbers and also stock adult BG to jump start BG reproduction. IMO you need to create the right size structure (not just dump in double the amount of 2 in BG) to sustain the forage population. Not sure what your forage options are in your location. You need an adult sustaining forage base to move forward. Using this approach also allows you to stock advanced size predators but the numbers need to mesh. Feeding will speed thing up also.