CC 1.5ppm means you've still got a ways to go. Having the water turn from yucky green to whitish means you're killing algae and have dead algae in there that needs filtered out. Continue shocking. You're doing the right things. As you know, the more times a day you test and re-dose with bleach to take it back up to shock level, the faster you're gonna get this under control. Run your pump 24/7 while you are fighting this, but keep a close eye on your filter pressure. If it increases by 8-10 psi over your clean filter pressure, backwash. Keep us posted!