Without LML installed and in my GTA V directory, I can get the game running no problem with custom gameconfigs. With LML installed in the directory however none of them seem to work when installed manually through openiv, or through LML itself, and I've tried five different gameconfigs at this point. All crash at the loading screen at the exact same time.
I should also point out disabling my antivirus, which I thought may be the culprit, had no effect either unfortunately.