@SketchyI disagree on your first point.
I think the current MAP cost will make the wars more dynamic. If increase it will minimize the power of a counter offensive. We wanted to make wars more interesting here the answer! The way to counter this is having Naval.
Let's say we increase the MAPs to 6. Scenario beginning of a blitz: Nation A has 12 MAPs, Nation B has has AS over Nation A, Nation A has more boats than Nation B, but the same amount of ground force as nation B.
Nation A can do a naval and remove the AS. Cost 6 MAPs, 6 MAPs left. This allows Nation A to do only 2 ground attacks, when they have no advantage over Nation B on ground attacks. If we leave it at 4 this would allow nation A to try and do a third attack after TC.
It be interesting to see counterattacks especially with double buys.
There is one change I would make: You shouldn't be able to blockade if you remove GC or AS.
Also in the Naval Attacks make it default to Target Ships, like it is with airstrike.