If you are going to do this 'build your own bonus' bonus scheme it might be worth getting rid of the weather/lee for the French and the Spanish...
Also on the bonus front, it could be worth changing it so instead of gaining 1 army for the commanders instead they double the fleet bonuses above for their own fleet only. I think it would give the commanders a more tactically significant position on the map.
You also seem to have a lot of bombard and attack routes doubling up, which if i remember rightly from feudal wars does not work, an example of this is Victory
where they can both bombard and attack each other.
To slightly show the tactic of Nelson at Trafalgar a bit more you could cut down on the attack routes between French and Spanish ships where the British have cut the line, because the basic tactic of Nelson was to create a bottle necks in the French and Spanish line so if you removed the attack lines between: Neptune
and between: Pluton
Slight nitpicking realism (so only do if it is a simple job which i fear it will not be, but i will put it out there)
constant wind direction, the sails on the ships are not pointing largely in the direction. (Once again i wish to point out this is NOT important)
Back to HMS Africa
, i always thought this ship was not part of the weather line, having been separated from the fleet it attacked in a completely different way, but i think giving it its own bonus might just cause confusion so it might not be worth the confusion just for a slight addition to realism
I would like to add that i love this map, and even without the above suggestions i think it could easily become my favourite map
Keep going on this and it will end up an amazing map