I don't know if this is your case but ..maybe the liquid poo is ok. Any other kind of poo? I find that sometimes it's soft, sometimes harder.
Also, really starting at three weeks my chickens are excited to see me all the time, me, wife, daughter, or the dog - if they walk by, the chickens get excited. I also see them now racing around in the brooder ..flapping wings ...if I open the top of the brooder they fly up and perch on the rim ...it took them a good week til they were good at it, until then, they were poor (although mostly successful) attempts.