I would say the chlorine loss could well be down to the polyquats you added which is really junk anyway. Polyquats wont clear an algae attack and increases the work load on the chlorine burning out the polyquats as Ben would have told you, sounds like you are a little to pool store, return to light! ;-)
If you have your free chlorine reagents now and are waiting for the CC reagent then as said previously get an OTO test kit as that only really measures total chlorine anyway.

Oh and your TA isn't too low either for a vinyl liner pool, so long as your pH doesn't climb the TA is fine.