Is this a modpack or mod issue?
No

PLEASE MENTION IF YOU ADDED ANY MODS.. ESPECIALLY SODIUM, IF YOU DON'T, IT MAKES US VERY GRUMPY
None

Modpack Version
2.8.7

Describe the bug
Cant set Xmx and Xms variables to allocate more memory to server instance when using the includedf server start batch file. Tried editing and adding the arguments in the script but that only seems to run the jar that modifies and runs the server.jar

To Reproduce
Steps to reproduce the behavior:

1. Go to '...'
2. Click on '....'
3. Scroll down to '....'
4. See error

Expected behavior
Run with more memory allocated. Usage is at 4G and having issues

Screenshots
If applicable, add screenshots to help explain your problem.

Logs
(you can use https://paste.alloffabric.com)

Additional context
Add any other context about the problem here.

NVM I figured it out after some research. The arguments are packaged in the .yaml file in the root. So modifying it instead of the batch file did the trick.