I would go the Trout route before going the Crappie route. For growing large LMB, all you have to do is look at the historical data from the California Reservoirs. Castiac, Dixon, Casitas, Miramar Reservoir, etc. All of them get winter stockings of Rainbow Trout on a weekly or bi-weekly basis. RBT have a lot of calories per mouthful, more so than Crappie.
Here's a link to the Ca DF&W stocking dates for RBT. Look at the frequency that they plant them, and then bounce around the different lakes to see what fish species are in them, and the stocking rates.
For instance, look at the frequency and rate of RBT stocking in Castiac:
http://www.castaiclake.com/fishing.html Keep in mind that the lake is 2,400 acres. BUT, you can see that they stocked 8,000 pounds of RBT in November alone one year.....
