Hi,
The customiser change the health (and lot of other things) of zombies making some stronger or weaker.
The "strong/weak" writen in the "Spawn System" is only an information to help admin tweaking things but have no code link with "Customiser" values.

Of course when you use the customiser with default values the 'strong' categories (from spawn system) will mainly points to stronger zombies (from the customiser).
If you don't use the customiser all zombies will have the same characteristics and the categories will only help to have appropriate zombies (that don't break immersion) depending on the environment.

How zombies are chosen:
First a the static or dynamic system choose a zombie "configuration" depending on the type of spawn (no randoms).
Then, in the appropriate "configuration" line (in ZombiesChooseCategories.c) a "category" of zombie is randomly choose between three categories (more informations in this file to see how it works).
Finally a zombie is randomly choose in the appropriate "category" in ZombiesCategories.c

Thanks for the detailed answer - makes sense.

I am trying to edit an existing static spawn in StaticSpawnDatas... the file refers to data_HordeStatic101 through to data_HordeStatic228... however where do I edit what zombie type (I want a custom zombie) I would like to spawn in data_HordeStatic228 for example? ...

Also rather than removing one you've already designed... would you abvise to use some of the lower unused values like data_HordeStatic270 - data_HordeStatic284 for example?

You can use 270+ static horde if you want to keep existing static spawns, just don't create new lines (370+).

To choose the zombies you spawn you have to :
in StaticSpawnDatas.c choose a value in "ChoseZconfiguration" column (for example 90),
then in ZombiesChooseCategories.c choose 3 categories in "data_Horde_090_ZombiesCategories" line (because you chose 90 configuration).
then in ZombiesCategories.c set what zombies you want in the categories you choose.

Thanks. I got it working. However now I’ve ran in to another issue. So I have a new zombie from FS spawning. It has its own group, and new static spawns. However the loot.c doesn’t seem to be detecting the new group.. as it’s giving the zombie loot from “the others” group you’ve created. However the group is correct.. as it’s used to spawn the custom Zombie. Anything you can suggest I’m doing wrong? I can add pics if you like?

Can you send me your ZombieLoot.c on discord Liven#0879

Thank @Liven you're a star! Thanks for helping getting it working... I had an error, within ZombieLoot.c I thought it would spawn items based on the category defined in categories.c, however it is based on classes of zombies (ie _base and its children). Thanks!