With an SWCG, the FC level must be at least 5% of the CYA level to MAINTAIN sanitation.

The BBB method and an SWCG are NOT different systems. BBB is a methodology, a system YOU practice.
SWCG is simply a way to introduce chlorine into your pool, continuously. No more than that.

You should be always using the BBB method. BBB stands for "Bleach, Borax and Baking Soda" but that's really only a quickie shorthand for the principle of testing your water religiously, and adjusting it as it needs it. Daily simple Chlorine and pH testing lets you get ahead and stay ahead of problems. An SWCG can make it so you don't have to do so much, but it's just making it easier.

But now you have algae so you should either turn the SWCG off or pretend it's not there, and use plain old bleach or liquid chlorine to dose your pool up to the shock level indicated for your CYA level, and keep the FC level there, testing 2-3 times a day, and adding bleach/liquid chlorine to raise it.

Let's get the algae killed first, then worry about the pH, and finally, after that, adjusting your SWCG to be optimal.