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You can liven up the game all round by changing the values of "MIN" and "NAT in the colonists.csv file from 1 throughout, to 100 throughout. This means other than the countries listed, everybody in the world with a coastline gets one colonist a year from dynamism. That should bugger the works :D
 
Coastline

Worth mentioning again, that a coastline is not sufficient, a port is required.

Also, to be totally precise, a slight reordering of my factors is required.

1) If you get an explorer or conquestor (random or otherwise), you will get a colonist. [this moved up in the list]
2) You will not get any additional colonists unless you have a port.
3) rest of list