I think my tweaks for FotS are done.
Working on tweaking the main Shogun 2 campaign now.

Gatling Gun range increased to 300!
As if they weren't already OP in this mod...
Gatling Gun campaign range increased from 12 to 14.
Parrott Gun campaign range decreased from 15 to 14.
Armstrong Gun campaign range increased from 12 to 13.

Gave Yari Kachi the Pike Wall ability.

Matchlock Kachi now have Rank Fire.

Yari and Date Samurai now have Pike Square.
Yari Heroes now have Pike Wall.

Parrott Gun no longer attrition immune to give more incentive to use Armstrongs in this mod.

Reduced the gun crew size for Armstrong and Gatling Guns so each man has a horse.
Didn't have to do this for Parrott Guns since I did that in patch 22.

Gave all FotS artillery units 6 horses instead of 2.
Buffed the Armstrong Gun's marksmanship and reload skill stats but they're not able to run like the Gatling Guns and Parrott Guns.
So now both guns have separate roles.
Parrotts = Worse But Fast
Armstrongs = Better But Slow
Gatling Guns = Gatling Guns

Adjusted some diplomacy values.
Your long time allies should now stick with you through realm divide.

Made Parrot Guns faster but they have less crew now.
Also made them attrition proof since they're the most simple functioning of all the artillery pieces.