I'm intrigued by the changes you have made to Wind Speed in this mod, but can't quite understand the diagram. (see below)
If I understand it correctly what you are explaining is that in the standard ETW game (I assume you mean't NTW too) ships move at a percentage of their maximum speed depending upon their point of sail.
So, when running with the wind behind them they suffer a 35% penalty to their movement, when reaching its a 70% penalty and when turned directly into the wind its a 100% penalty (e.g. no forward movement)
If I've understood that right then your mod reduces the penalties when running before the wind to 10%, and when reaching to 60%, but I don't understand why the diagram suggests that the penalty when sailing into wind is now only 75%, whilst its 100% when close hauled.
That can't be right based upon what you say the mod does, so I must assume I'm misreading the diagram.
Incidently, my own experience of sailing and the research conducted by Edwards and McKenzie for their Napoleonic Naval Wargame suggests that relative speed through the water varies according to point of sail as follows:
Wind over the beam or quarter (Reaching) = Fastest point of sail (100% movement)
Wind from astern (Running before the wind) = Slightly slower (approx 80% movement)
Bearing to windward (Hauling/Close Hauled) = Slowest point of sail (approx 50% movement)
Turned Into the Wind (Luffed) = Negative movement as the ship drifts downwind.
So, the logic is that ships sail fastest when the wind is blowing over their side, as the maximum sail area is being presented to wind at that angle. When the wind is blowing over the stern some speed is lost because some of the sail area is masked by other sails, and when the wind is coming over the forward quarter the reduction caused by masked sails is made worse by the wind pressure on the hull and sails trying to drive the vessel downwind. Finally when the ship turn direclty into wind the entire force of the wind tries to drive the ship backwards, although the natural tendency is for it to swing off the wind and back onto its previous course (broaching to).
Approximate angles on the bow for square rigged ships are given as:
0-55 degree's (Luffed)
56-79 degree's (Hauling)
80-160 degree's (Reaching)
161-180 degree's (Running)
Just thought you might find that useful.