Also, if we consider the leaked patch notes, it seems that they will decreas the FS disc. from 20% (now incorrecly stted 15%) to 15% (so from 60w to 64w), basically now you get 5 FS for the price of 4, with 15% it would be 6 for the price of 5, and for the dark age is a significant nerf.
My initial idea was to make 15% in dark age and 20% in feudal, but I dont’ think it would be that way.
So another way to compensate for this nerf would be to give them back (on top of their 15% disc.) their old bonus of +2LoS (could be even 3) on their FS, making them at least a bit more efficient (but still not on pair with japs FS or galleys).