Why is my FC and salt level rising?

May 11, 2016
4
Oklahoma city
My pool has been used quite a bit lately, and the temps have been high, but I am only running my salt generator at 35% to keep the FC level at about 4. If I raise the generator percent to 60% the FC raises up to about 7 or 8. The salt level was hovering around 3,400 when I replaced some water, but now it's up to 3,700. My TA is 80, the PH seems to creep up to 8.0 (because of the bubblers/ aeration?), and the CYA is at 50. Just wondering what is causing the FC and salt levels to raise so easily.
 
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