I like to use liquid chlorine as part of my SWG adjusting process, unless the adjustment is minor. Here's how, after buying some chlorine.
Determine your target FC level. A lot of us like to make that at the top of the suggested range for our pool, to give us a little buffer.
Use liquid chlorine to bring your pool up to the target FC. Note the time, you'll do the following at the same time each day.
Next day, test your FC. If the FC is low, use liquid chlorine to bring your pool back up to target FC, then adjust the SWG % upwards, 5 to 10% depending on how low the FC was.
Repeat this process, every day, same time, until your FC holds.
If your FC is high, then back your SWG % down a bit, check it again the next day, same time.
The idea is to move your FC with liquid chlorine instead of trying to do it with the SWG. You'll find the correct % faster that way, because if you try to move your FC with the SWG, you'll be bouncing around with the % based on what it takes to move the FC, when what you want to know is what % is required to maintain FC. SWGs are not designed to move FC significantly, it takes them a while to catch up, which is why it can be a frustrating process without the liquid chlorine.
Hope that makes sense...
I keep a gallon or two of liquid on hand for when my pool needs a bump, like just before a big pool party, and after, or for some other event that hits my FC hard, rather than use my SWG's "super chlorinate" mode. Again, it's just faster that way, and I don't like to let my FC drop even for a few hours.