Sorry I didn't check in sooner, been busy - beautiful day.
So ... you're right on the edge. 1 ppm FC lost overnight and .5 ppm CC yesterday.
I'd backwash even if the pressure hasn't risen to get rid of the stuff that's been filtered out. I'd also do the evening and morning FC check again tonight - just to be sure.
Next, you need to decide how to raise your CYA. I presume you want to get it to 70-80 for your SWCG.
If you're willing, you can manually chlorinate with dichlor for a while - each pound of dichlor should raise your FC by 3 ppm and your CYA by 2.7 ppm and drop your pH by 0.11.
Or you can use CYA, each pound should raise your CYA by 5.4 and lower pH by 0.1 and turn your SWCG back on.
Let us know how you want to proceed and we'll be here to help.
What's your pH? you'll need to keep an eye on it as you raise the CYA.