5000 gallon vinyl pool

TA - 70 consistently since pool filled 1 week+ ago.
just tonight measured at 80?

PH floating between 7.2 and 7.4
just tonight measured at 7.0?

FC between 4 and 6.8 over the past few days with bleach added 1-2 x daily (not measuring bleach yet, just eyeballing right now) CYA 30-40

CC teetering between .2 -.4 (is CC this low a problem?) it goes to .2 when FC is closer to 7 and .4 when FC is closer to 4. Should I raise FC to about 10 to get CC to 0?

Why did TA raise? I haven't added anything but bleach.
Why did PH drop? It hasn't rained.

I'm still trying to get a handle on pool chemistry

Thanks