I also played 5 turns only, the MM'ing can be quite heavy.
(Comment on the peace deal with Rome, you should've gotten a tech for gpt. That's our best chances to get any techs at all, except by stealing.)
Pre-turn - GA seem to given up on this game
MM all cities to maximize income, growth and builds, Join some native workers to cities and it goes from 233gpt to 314gpt.
Rush library in Plainville.
Diplo is a mess, stealing won't help us much atm, so I rather use the money we have. Buy incense from Greece for wines and 280g and we can lower luxtax to zero, which gives us 405gpt.
I will steal later.
Deals expire next turn with Portugal, plant a city near Hlobane, their rubber city and move some troops over there and to other cities around that area.
1680AD - Rome start SETI.
Reneg peace with Portugal, get Steel and 742g for 101gpt, horses and saltpeter.
1685AD - Reneg peace with Greece, get Combustion for 134gpt.
See that we haven't built Military Academy yet? Start that in Paris.
1690AD - Try immediate steal from Viking and succeed, take Flight.
Oops, built a reg cav. Very clever.
Join the last native workers to cities.
Give them 2 luxes and saltpeter for their spices.
1695AD - Plainvilles borders expands and I sneak in a city next to an oilsource.
Start building a bunch of bombers.
1700AD - We build our first 2 bombers.
Military Academy is done in 3 turns, we want armies.
We can buy rubber from Rome for 2 luxes, but I don't really want to help them with their happiness.
Peace-deal with Vikings is up in 4 turns, reneg and get us Motorized Transportation, if you haven't stolen that yet. Watch out who you steal from.
If there is a chance to poach the rubber SW of Plainville, do it. We have a settler somewhere.