Horace - you'll need to experiment some...
I would start with an Octura 1440 or Dumas 3004 and trim them down slightly if needed. That way you'll get the max amount of flow out of them without playing guessing games with props.
I have trimmed down numerous props and they always work just fine... balance of the prop is not as critical as some seem to think (not critical at all IME).
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