A disproportionate part of your < 7 in BG will be females. Can you ID male and female BG? An easier way to remove small BG is with a seine. Not sure what your goals are from above. Unless the populations are unbalanced you should not need to be stocking more fish (forage) every year. If your RW are all good you should try no additional forage with increased predator harvest , depending on goals. 150 lbs of additional forage is not much (but expensive) in a pond full of fish. 25 1 lb LMB will easily eat 150 lbs of forage a year.