Yes I understand.
But this is the only thing I have to reproach to some new custom settlement (dol guldur, imlandris...), it's the lack of space. Lack of space means lack of defensive possibilities, which means lack of strategy, which means lack of total war.
Some settlement are boring to defend because there is not enough space to do anything : you just put your archer at the same spot, your infantery at the same spot and wait the end of the battle.
Anyway, this is just a suggestion, not a complaint, and your settlements looks awesome anyway
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But in my opinion and on a strategic viewpoint, I think you could increase the size of carn dum, even if it makes it a little empty.
And don't worry, I trust your competence, especially after seeing dain's hall