Oh, sorry, I missed that the first time I read your post. That probably did bring it up beyond 8, but you're going to need to keep it there, at least 8, for as long as your CYa is that high. Not sure what the chlorine source of Super shock and Swim is, but if it's dichlor you need to stop using it because it raises CYA even further. You're probably okay for awhile if it's cal-hypo, but when your calcium numbers start getting past 200 or so you'll need to switch to bleach or liquid chlorine.

Janet