This was too long to put in the comments, I would have to separate it into 6 separate ones so figured I'd just put it in here;

Long standing vanilla bug with the Flotsams; Their units use the Ninja 40 and Ninja 60 Stat value in FCS, the only faction to do so, and those stat values are wildly off from how other NPCs are done. Others all have equal attack/defense values with small randomized variations, whereas Flotsams use those two stats. First first is 40 attack/10 defense, and the 2nd is 60 attack/20 defense. This results in Flotsam units dying like flies in any fight because their defense stats are just insanely low, and then further modified by the fact they use Ninja Blades with a -2 defense penalty. I would highly recommend either fixing those two entries to make the defense same as attack, or removing them from Flotsam character entries altogether and use the character entry's "combat stats" line to set them, as is done with other units in the game.

Also a few things I noticed that could be improved;
-The "fertile holy" biome resource entry is used by many regions, not just hidden forest, so the changes to the iron resource value will effect all of them (Okran's Pride, Arm of Okran, etc). A separate Biome Resource entry should be made an applied specifically to Hidden Forest if you want to modify the resource values beyond just the fertility ceiling.
-There is a vegetable farm in Flotsam that is still at 0 yield because of environment. Should be changed to a different crop type.
-Heavy Flotsam Patrol should have the squad numbers adjusted to be more in-line with the vanilla patrol and work better; Add a squad "leader" entry with a Flotsam Jonin. Squad numbers should be changed to Jonin: 1, 3 and Ninja 2, 6. This will be the squad numbers in line with the other squad of Min 4, max 10. with at least 2 and up to 4 of them being Jonin.
-The racial makeup of the faction should be changed to the following; Greenlander 65, Scorchlander 25, Shek 4, Hive 5, Skeleton 1.
--The reason for this is that most of the HN population, and even most of the non-Shek HN slave populations are Greenlanders, not Scorchlanders, and so the majority of Flotsam's membership, consisting of ex-HN women and ex-slaves will still be majority Greenlander, though with a decent number of Scorchlanders. The numbers of Shek, while high in the slave population, would be low in the Flotsams as most Shek ex-slaves who escape will go south to their own people, with few deciding a join a group of ex-HN women in the north. Hives make up a very small amount of the HN slave population, and are treated more harshly, so very few would live long enough to escape slavery. Those that do will by-and-large want to return to their hive if possible. Skeletons are rare, and HN kills them on sight, so there are no ex-slave Skeletons. The only ones who would join the Flotsams would be Skeles who want to fight against HN's slavery, but even then most would simply join Tinfist if that is their goal. Personally I would actually put the number at 0, but if you absolutely want some, keep the number very low 1-3%. These ratio changes also need to be copied over to the Flotsam police faction.
-Flotsam Citizens and High Jonin need their female spawn chance increased to 80% to be in line with the faction.
-Flotsam Barman should be name changed to Bartender and changed to 100% female chance.
-Flotsam HQ Vendor really should be female as well.
-Flotsam Police Chief is currently 70% chance to spawn as male, which is completely out of character for the faction. Most of Flotsam are ex-HN and ex-slave women who have spent their entire lives being oppressed by the HN's patriarchal society. They would definitely not find a male being in charge of enforcing rules as acceptable. This should also be 100% female spawn chance character.