Tomi,

Are you definitely moving the CWC Shogun Contest to STWmod for MTW/VI? If so, you'll probably pick up some new contestants, but also loose some of the old contestants. Keep in mind that the maps in MTW/VI have a 3 tile red zone which cannot be entered while the maps in STW have a 2 tile red zone which can be entered. That takes away a substantial part of the playable area of a small map. If you did move to large maps, you cold go back to a 4v4 contest if there's enough interest. I have played 4v4 STWmod on large maps, and I don't think fatigue is too much of a problem.