I think cum on upper body and cum on lower body should be nuked (aliased into cum on body) and common fetish tags like cum on feet and cum on armpits should be unaliased, as long as they're relevant and not dumb things like cum on knees or whatever.
Cum on upper body and cum on lower body are garbage tags, nobody has an upper body or a lower body fetish. They're useless for fetishists because they're too broad for specific fetishes like armpits or feet, and they're useless for non-fetishists because normal people don't care about this upper versus lower body distinction.
Ironically, these upper/lower body tags don't reduce bloat, they increase it. For a cum on breasts post, instead of having just cum on breasts + cum on body, we get cum on breasts + cum on upper body + cum on body. Three tags instead of two. For cum everywhere posts, instead of having a single cum on body tag, we get three cum on body + cum on upper body + cum on lower body tags. This increases the tags per post, not reduces it.