One thing i think would be good to do is to make some of the bases smaller.Like the Sand,Akatsky and maybe the Leaf village.By doing so you will give more room for creeps and so the bases arn't so clsoe to each other for better leviling so your not so close to the enimies.

The sizes of the bases are fine. It allows more room for further shops or destroyable buildings in the future.

Well that would be good but only if they add more shops or like you said destroyable buildings.