Sorry, I really never figured it out. I remember someone mentioning on the Parasites forum a while back that they may be tapeworm eggs or eggs of another parasite, I'm sorry I'm not sure.
I don't mean to be graphic and gross you out, but it was like the whole solid feces had these white specs embedded in them, and maybe floating. That's how I recalled them. I only see them when I'm parasite cleansing too.
I actually haven't tried humaworm, but it sounds like it's working great for you :).