Did it, and as allways ,did it big.
Remarq
Playing a modded version with big units and a lot of starting money
Put 90 as value
After turn 4 there was for my onpinion a good spawn of pirate ships.(you see the difference between 65 and 90.
Now i have to put some mone in a "full time" fleet to hunt those pirate.
After turn 10 there was almost every turn a batlle with my ships and pirates.
So as you sayed 80 would be good.
Will check this in the WE.
Were are all the others.
Ooh yes it was a little work

Hope that hels you a bit SV