FWIW when I get into tension issues I find corrections go best when I stop, rethread, dust and reseat the bobbin.
I then stitch on a test piece of similar construction to the quilt. I adjust EITHER the bobbin tension OR the top tension first, stitch a bit and decide what to do from there, checking both back and front.
Sometimes it takes a bit of back and forth.
I also find on some machines as the bobbin gets to only 1/4 full, the tension changes.