The pH went up because your chlorine level is so high--chlorine levels above about 15 ppm on the Taylor kit will give falsely high pH levels, so don't adjust your pH any until the chlorine comes back down and you get a reliable reading. I suspect that's the same reason that your TA changed colors the way it did.

If you are still losing 4 ppm of chlorine overnight, then you are indeed still fighting something in the water. Maintain your shock level until you don't get an overnight drop, and then you should be ready to close the pool.