Solid map so far - I like the idea of the 3rd where it so obviously belongs to 1 player that you'd never expand the other way. Pretty much solves the positional imbalance problem by taking it to the opposite extreme, especially since the fact that you have 3 bases behind 1 (extremely wide) entrance means that the ground distance between 3rds will basically be the same no matter whether you're moving counterclockwise or clockwise.

Overall layout is pretty boring though, try to think of some stuff to put in the middle.

I wanted an open middle for this