Cya at 65 is OK as long as you keep your chlorine between 5-10 all the time. Having it at 0.2 is an open invitation to algae. (No more trichlor for your pool.)

Your ph is a little low. Add a fourth of a box of Borax slowly to the skimmer. Retest it after it has circulated for several hours and redose if needed to get ph to 7.4-7.6.

I'm not the expert on chlorinators, so I'll let someone else address that question. People typically don't have issues with calcium hardness until they get above 500 or so, although it does vary.