I'm not entiey sure of it, but I mostly think of it as a 2 level thing for everything.
so home gets 2 levels higher. CT gets 2 levels higher, TIE gets 2 levels lower.
If I compare this to what you said I come to this:
CT with level 4 enth. will be level 6
homecourt with level 7 enth. and playing normal will be level 9.
So in this case I'd bet my money on the home team!
For your other example level 6 against level5 with homecourt (making it level7) I'd also say the hometeam gets it...
this all is a very personal meaning, so please don't shoot me if this is not correct for anyone else.
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