[Boron]

What about using tka's spell/item limiting mods ?
Or making a small mod yourself ?

You could e.g. just mod out wrathful skies and a few other such "uberspells" and limit construction to lvl 2 e.g. .
This way it should be harder to do overwhelming SCs .

I have some concerns about rule 2 : only size 2 recruitable commanders may be turned into SCs :
Any knight is size 3 .
So nations like jotunheim , vanheim , man etc. are a bit disadvantaged then maybe .

Finally what about blood ? If someone plays mictlan e.g. and may not use blood he is severely disadvantaged .