Moved in 2 months ago to a beauty of a pool with a problem (I learned here)

previous tenants horrible regimen was shock and tabs. I inherited a 30k gallon pool with out of control CYA. It was prob 250+

Drained 2/3 of it and refilled so now its under 100, but just so. Looks like 80. I understand the BBBs now so only have a couple questions until my Taylor complete gets here. In the meantime i have a Taylor basic phenol red kit with CL and PH.

1) Chlorinating. Home Depot and Walmart nearby have 8.25 cal hypo bleach in 121oz container, but Home Depot has a Kem-Tek liquid CL box (2 gallons for $6) that is a slightly better deal. It reads 10% Cal Hypo and 90% 'other'. Anyone use this? Would love to be damn sure there was no CYA in it. Read everywhere, even their online docs, no mention of it. I Have read that 'liquid chlorine has no stabilizer' but it's surprisingly hard to get an exact list of ingredients on anything.

2) Read the best-guess chart about where to take the CL level to for both shocking and maintaining so since I have a bit of green still after the refill, with CYA there should I take it up to 20 asap? I am aware it might take awile for it to come down...

3) PH is 8, should I take that down a bit before raising the CL?

Thanks in advance, Rob