I would try NO nutrients except a tiny bit of B1 (your choice) while trying to get cuttings to root. And yes, keep your light back. If too many leaves are yellow, she's a gonner, sorry. You should try to take your cuttings during veg so they don't have to revert back to veg before rooting. You might try flushing to get out any crap it doesn't want, then you can start fresh