City sizes.
I've played two DYP games so far. One at chieftain and the other Warlord. Ive noticed that AI cities appear to grow at half the rate of mine.
Taking a snapshot at the year 2050.
Chieftain
My top 3 cities: 23, 20, 20 size.
AI cites: 12, 12, 11.
Warlord
My top 3 cities: 15, 15, 15 size.
AI cites: 7, 7, 6.
I dont know if this happens at higher levels yet. If it does may I suggest a small change to help the AI city growth.
Increase town size to 8 or 9.
Increase City size to 16 or 18.
Move the improvements Aqueduct and Sewer further back in the Tech tree.
In my warlord game I was initially well behind militarally, and lost most battles and had to sue for peace and pay bribes, until my cities began to outgrow the AIs, then more production and science income allowed me to catch up and overtake the AI players.
Its a pity there are only three city levels allowed, I was originally going to suggest adding two more city growth improvements in population steps of 4 or 5, until I looked at the editor.
i.e.
Size, Represents, Needs.
1 - 4 Hamlet nothing
5 - 9 Village Stone Works
10 - 14 Town Aqueduct
15 - 19 City Sewer System
20 + Metropolis Water Treatment Plant