Interesting conversation ! From the info provided it looks like OP has a more or less balanced BG population at this point (all sizes of BG present and growing). The conundrum is time. If you want it fixed fast ,you do one thing (rely on the newly stocked LMB adding numbers of larger LMB than suggested)) to control and if you want a longer term fix (relying on the smaller newly stocked bass plus their offspring) to control that is a longer term project . Neither is a permanent fix as over time one of the populations (BG or LMB) will get out of balance with the goal. If you want to hedge your bet then reduce the # of smaller LMB to be added by 20% and add 5-6 12 inch LMB. That will speed things up and likely add an additional year class of LMB. Lots of unknown variables at work so with all of our suggestions - buyer beware.

As to Bill's points on carrying capacity in this pond as described, my guess is no more than 200 lbs of total fish.