Perhaps the best plan might be:
Stock smallies first, and have them set up shop for 1-2 years, eating eating eating. Say in a 1 acre pond drop 30 smallies.
1-2 years later, when smallies are at least 12-14" in size, stock largemouth bass fingerlings 4-6" in size. Say in that 1 acre pond drop 10 largemouth bass.
You now have 30 smallies (forget about any spawn and mortality for argument sake) twice as large as the largemouth, and three times as abundant.
Maybe the size _and_ the pack mentality / territorial pissings would slow the largemouth takeover to a period of years.
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