[Master Belisarius]

Honestly I dislike the idea to require at least 10 minesweepers to the AI. Why?
Because the AI doesn't know how to use the minesweepers: the AI doesn't know that need to group them and include them into the attacking fleets...
Then, IMHO, 10 minesweepers should be a waste of resources (depend of the stage of the game).

I think that the best option (not the perfect option), is to include at least one mine-sweeper component, inside the attack ships.