That is what we suspected -- high CYA from using pucks so long. You are right, test strips don't work.

The bad news is that since CYA testers cannot differentiate over 100, your CYA level could actually be much higher than 100.

You basically have two options:
1. Do a partial drain and refill to try and lower that CYA level. (Do not totally drain however.) I think you said that you are in a drought, so this may not be a viable option for you.

OR

2. Live with the high CYA and just run higher than normal chlorine levels to compensate. Take a look at the Best Guess table in my signature below for more info about this.

Let us know which option you want to go with and then somebody will help you. Also, when you repost, please give us a new set of current testing results for everything. (You don't need to run the CYA test again, however. No reason to waste the CYA reagent.)