CYA Test with Taylor K2006 - CYA over 200!

[ubalr1]

I just received my Taylor test kit this week and made my first tests. I already knew I had CYA over 100 (pool store results) so for my first CYA test I used a 50/50 mix. That is, 50% pool water sample mixed with equal amount of tap (non-CYA) water. The results for this attempt was 100+ of CYA (watching the black dot disappear, etc.). So I started over. This time I repeated the 50/50 mix. Then I did it again - I took to 50/50 mix and mixed it again with equal parts of tap water. So now I should be at a CYA of 25% of the pool sample. Someone check my reasoning here, am I on the right track? Any way, the CYA test results with this 25% mix came in at CYA of 50-55. Doing the math, my actual CYA is 200-220! We are deciding when to drain the pool, end of this season, or now. We haven't decided. Here are the rest of my test results.

FC=.6
CC=.6
pH=7.1-7.2
Alk=90
CH=60
CYA=200-220
water temp=87

I not sure I believe the CH numbers yet. Most of the pool store readings for my pool have been in the 450 to 550 range. I need to recheck my CH (btw, our fill water is very hard at 19+ grains or 324.9ppm if I used the correct conversion)

[Edit - Pool store measures and reports Total Hardness, I only tested for Calcium Hardness. Now I'm worried my CH is too low]