Patty, all the advice given was based on your reporting of CYA of 50. With it being 100, that changes things. (And,since kits can't differentiate past 100, it might actually be higher than that.) Like Ben said, look at the Best Guess chart. Your shock level should be 20 instead of 15. Just for good measure, I'd shock it up this evening to 20 and see what the reading is in the morning within 2 hours of sunup. Hopefully you'll find that you didn't lose more than 1ppm of cl. As he requested, post a complete set of new numbers.

(How did you get the CYA reading of 50 before?)