I am really confused on how i go about setting up individual stack sizes,

In the previous version i just went to the data folder and put in the size i wanted for each item,
i have tried to look through the documentation but im lost.
Tried to edit the data file but it keeps reverting back to the config's settings.

how should i set up the config/data so i can do each items stack size?

Unload StackSizeController, modify the data file as needed, load StackSizeController. That should preserve your settings. Enhancements to this process will come in a future update.

Allright, will try that. i currently have the config multipliers set to different amounts, should i set them all to 1?

And thanks a lot for your work and fast answer :)

The multipliers will multiply the datafile customizations (reflected in-game, it won't actually modify the datafile values) so you will want to set them to 1. You can use stacksizecontroller.setallstacks 1 to do that automatically.

Awesome. Got it sorted out now, thanks :)

Hard limits can be defined in the configuration in the latest update.