I have really enjoyed 2.7, there has been really positive changes to the AI and large performance improvements. Thanks for all the hard work.
My suggestions and observations:
General -
The possibly of a power entering from the Pacific or South to prevent the clustering together of all the powers in the Northern continent, which leads to slower development and more conflict and many parts of the map untouched.
Roads should automatically be built on the tile a settlement is founded on and they should upgrade with the town hall to represent the towns infrastructure as it grows.
Maybe rename coastal ships to flotilla or fleet as they seem to represent many boats. The term small / large boat also seems a little odd when all the other units have historical names.
The AI loves to spam massive stacks of coastal ships, which are then easy targets for privateers.
Increase the space between cities to two squares. This will prevent the AI from spamming cities that cannibalise each others resources.
Russian AI seems to be poor at building roads.
To move or change the value of the Religious Founding Fathers, Nathaniel Hawthorne's bonus is very strong in comparison to Tome de Sousa.
The AI's reaction to declaration of Independence is strange, Simon Bolivar gave me units but several turns later declared war at pleased with a really weak invasion force.
I feel you should take a look at rebalancing the constitution mechanic. Perhaps "All men are free" should allow you to turn the slaves into free colonists. "Right to Bear Arms" should do more than add a trivial boost to colonists.
I'd like to see more boom and bust events, this would require you to make the most of your specialists and all the new resources in the game, and add more challenge. As of now the players economic strategy just seems revolve around having to prepare for diminishing returns.
I would like to see more challenge in the Revolution, perhaps as happened in history pre-rebellion the King could deploy units or build forts in your lands. Or the Rebellion rate would be capped at 75% relying on you facing a little more struggle at the start of the Rebellion, rather than a universal consensus that the Rebellion is good.
Military -
If the Natives kill units like rangers / native mercenaries etc they don't receive guns, this should be brought in line with the other units
Take away the ability to attach Great Generals to scouts and settler militias, the AI likes to do this does this to with obviously suboptimal results.
When natives offer to sell you mercenaries it seems that you can always get them for half price by choosing "That is too expensive" option.
During colonial wars enacted by your King there seems to be no end point or recognition of the war, destroying the opposition colonies doesn't provoke a reaction from your King and also doesn't seem to have any bearing on your relationship with the hostile King.
Tweak the Kings AI it seems to love landing units either directly outside the strongest cities or in remote areas which leads to problems in attacking.
Economy -
Financial demands from the Church / Pirates / King and Tribes selling units, should increase with income / rebellion level as its trivial to buy slaves and pay off Pirates during the late game.
The Tool factory seems inexpensive compared to other comparable buildings.
The Corvette seems to be overpriced in comparison to its abilties.
Change the prices and resources of the late game wagons, as of now they are far too cheap. The final wagon, seems to serve no purpose as it is outclassed by the carriage. The carriage being able to carry other wagons is also pretty exploitative.
I feel you should raise the price of Merchant ships in Europe, or require that the high end merchant ships demand a port with a dock to function, as of now why build anything other than the Galleon?