Easier way to add Chlorine

With CYA at zero, any amount of chlorine added will be lost each sunny day. You won't be able to maintain an FC level during the day until your CYA level comes up.

If your TA is really 430, you are going to need to lower the TA. First, double check the TA level, wiping the tip of the dropper bottle with a damp cloth/tissue when you start and after every five drops.

I would aim for a CYA level of around 40 to start with. You can use the Pool Calculator, see the link in my signature, to figure out how much you need to add to get there.
 
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