Wait on the CYA. You probably don't want to go quite so high with your chlorine since it is a vinyl liner. I'd probably go 15, 20 max.

if you have cal-hypo on hand, it is fine to use that for awhile since your calcium level is low at 70. But not for too long. High calcium can cause cloudy water issues. I probably wouldn't let it go higher than 200-300. Then just bleach or liquid chlorine. Or else, just forget the cal-hypo and stick with bleach. From your last post, you seem to be making some head way.