EEEEWWWWW peat moss!
Peat is a killer... it's got low pH and holds water like a bastard. Yup, you're overwtering... but you'll be seeing pH problems soon.
Check the runoff pH... I'll bet you're i the 5's. Flush with water adjusted to bring the pH in range. On the next repot, use a better soil mix (there's a VERY simple one in the link in my sig).