I added chlorine and three boxes of Mule Team.
Results:
FC 15.2
CC. 0
PH. 7.4
Total Alk. 100
CH 250

I followed the instructions for the CYA. 1/4 c pool water and 3/4 distilled water. From that one cup I took a sample and my reading came in at 35(x3)= 105. That's dramatically lower than the "off the charts" I was getting. Did I do that correctly? Happy it's lower but puzzled.

If this is the correct CYA now, then how high should my FC be?

Thanks for all your help. Please test my high school chemistry teacher I may finally be getting it...lol