|As you can see, the stitches on the top look fine, but the bottom the bobbin thread just lays on top of the fabric.|
|There is barely any difference between the tension being set at 1 and being set at 8.|
Updated June 20
After testing on another fabric, where the damned tension was fine (sigh), I removed anything removable from my machine. Cleaned the tension disks with fuzzy dental floss. Blowed air at the tension disks as well (canned air, not human air). The tension was improved, not perfect but improved.. Thank you all for your help! It is much appreciated.