There is a state yeast reach where they crowd each other out, I may have exaggerated that they kill each other. In any event, making a decent sized starter that will chew through the steam somewhat quickly, then racking off it, harvesting 1/2-3/4 of a cup of sediment, cooling to ~40 degrees, then pitching in the cooled o fest seems like my best bet.
Thanks for the suggestions, and watch out for hostile yeast!