You make a good point on the Indian terr attack to Georgia as S Carolina already has a ship. I'll make the change and include it in the next update.
As for downplaying the southern bonus, much of the war did not take place in the South, not to say none, and I think the map should reflect this aspect. Say, if you did capture up to Virginia, defending at Baltimore, Appalachia and Viriginia capes, you'd have a bonus of 1 for colonies and 18 terrs held, so 6 men traditional deployment, at a total of 7 deploy. Then with easy aquisitions of Delaware and Maryland to bring the bonus up to 4 men. Right after is another great defense point of Philadelphia, Delaware and Virginia Capes which should land you the game at 5 bonus men plus 7 regular deployment (The defense at best putting up 10 men total).
Doing the same thing at Philie, Brooklyn Heights and Delaware you land 11 men but still have a long way to go, giving the South a chance to fight, but the advantage goes to the North (which were the more valuable territories anyway).
What I just noticed is that Philadelphia is going to be a hotly contested territory, as it should be as it was the capitol at the time.
So yeah, in summation, I think the South will be quite powerful given its bottleneck points and should yield many men given its size rather than colonial bonus. But the North will be the more hotly fought over areas, as it was in 1775-83