Ideal CYA when using Liquid Chlorine

30 CYA is ideal for doing the SLAM. If you're below that, add enough to get to 30 and just pretend it's all dissolved already and SLAM at 12 FC.

After the pool is all sparkling and crystal clear, raise it to about 50 CYA. Unless the pool is out in a wide-open field where it gets full sun all day, that should be plenty.
 
There is no ideal. It is a balance of pros and cons.

Raise up to about 30ppm of CYA for the SLAM.

If your pool gets a lot of sun, then after the SLAM raising the CYA up to around 50ppm might lower your FC losses to the sun.
 
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