Is the fan pointed directly at the tub? That will dry it out and drop rh. You can’t really have too much humidity with cubes. If it doesn’t smell weird or sour it’s fine, no bacteria tam. You can try a pre dunk too if the sub feels too dry when you go to fruit.
I assume you basified it before salting out with the hcl. It looks the right color though. Should be good if you got xstals but I’m not an expert. Take a half g and see what it does, a third at a time over an hour or 90 mins to reduce stomach discomfort.