I was told by Raven to make this an issue

Notable mentions firstly:

DragonAPI B:"Player-Specific Mob Caps" crashes if set to true

Signpicture has a weird bug where it keeps popping up with a menu I've never seen before on the right hand side:
https://media.discordapp.net/attachments/1114674409303724042/1149038250757988442/image.png?width=1325&height=701

minetweaker gives this error: https://i.imgur.com/Cd3D2Jp.png

now here are all the mods I had to remove to get my pack to run with lwjgl3ify, every single one of these mods is incompatible with lwjgl3ify, i have tested them all along with a bunch of others that I previously removed, these are all the ones that have an actual game crashing incompatibility.

DivineRPG-1.4.1.5.jar
Farseek-1.7.10-2.0.1.jar
GlibysVC-1.7.10-0.6.2a.jar
Netherless-0.9.0.jar
SmartMoving-1.7.10-15.7-maka-18-g7a9291a.jar
SmartRender-1.7.10-2.1.jar
Streams-1.7.10-0.3.4.jar
falsetweaks-mc1.7.10-2.6.1.jar

fastcraft-1.23.jar and OptiFine_1.7.10_HD_U_D6.jar don't work

optifine E7 and fastcraft 1.2.5 work

DivineRPG, Netherless and Smartmoving are fundamental packs and highest priority in this list

here are all of my mods in my modpack without removing any for lwjgl3ify: https://pastebin.com/fv2xM715