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Heroes 3, I gave an example: how the game can be more dynamic on the strategic map than in Heroes 5. But if you take a small map in Heroes 3 (36*36), the game there happens too quickly (blitz chess). Naturally, I think the balance of the game speed should be oriented towards more common and larger maps (Heroes 5).
As for neutral castles, is it possible to make it so that one building is constructed in them each turn, and also troops are automatically recruited when they are taken? If not, the idea of having a few buildings built in them (the further from the main castles, the more buildings are built) doesn't seem so bad to me.
But I am strongly against the main castle starting with 4-10 buildings (unless it's for special maps). Tier 7 on day 4 is really detrimental to diversity and too quickly accelerates the pace and time of the game ("from rags to riches").