Hard to tell what to do with this madness, all features are out of balance scale. I would prefer to make thread for every feature changed and let community find solution. You already using them as beta testers so at least listen them.
My first impression about new concentrated development is: wow i can make north pole a megalopolis! Changing frozen wasteland, yes, logic is thrown out of window. It would be better if stealing dev would translate to new currency and used by dev cost rule (to use points only for deving with logic). Adding 3 dev into 3 dev province is not same as adding 3 dev into 30 dev capital! You can expand capital state which will increase cost for moving capital too (prevent exploit to dev everything around but not capital city). Sadly it will be almost same as razing mechanic ...
Galleys : they beat Heavies everywhere, got bonuses from inland sea and you can have 15% fighting ability from doctrine, also they are cheaper to maintain ...
I could go on but i think it will be waste of time due to ignoring our opinion in dev diaries ...