Getting my TF-100 Today! Will post results later!

Yes, if it's powder CYA, use volume. Looks like you're trying to raise the CYA by 40. Assuming you don't have an SWCG, it might be a good idea to start with 30. If you over shoot, only way to get it back down is partial drain/refill.

Please post a full set of test results when able: FC, CC, pH, TA, CYA.
 
You are letting the chlorine drop WAY too low. In normal (non-shock) mode, with a CYA of 50ppm, your FC should NEVER drop below 4ppm.

You also need to get the pH back into the mid-7s, to avoid scaling problems.

What is your CH level?
What are your FC and CC levels?
 

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How does the water look?

At a minimum you need to get the pH down using acid and the FC up and staying above 4ppm. You can make these adjustments about 30 minutes apart by slowly pouring the chemicals into the pool in front of a return.

You will need to keep a close eye on the pH as the high TA is going to tend to pull the pH up.

You should likely bump the FC up close to shock level (20ppm) and do an OCLT to be sure nothing is living in the pool or to find out if you should go through the shock process.
 
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