I need help

I've currently got a few mods install to my gta v so in single player the game looks a little spruced up but i have a issue where as soon as i add just one more car mod the game will crash every time, and I'm no sure why because I've have at least 3x the mods before with no issue, and yes I'm using pack file limit adjuster heap, and game config, and also streamerVariable and decals limit but for some reason i cant add anymore mods without the game crashing as soon as i load story mode