Well I don't have any experience with the slings you mentionned but I just wanted to say blessings on your little one. I looked at your website and it's lovely. Seeing your obvious joy brought back alot of memories for me of the early days with my ds. The pic of her tiny hands and mouth is so precious.
Ok back to slinging. What is happening with the zolo? Could you describe a bit more what isn't working for you? Everyone seems to be raving about the hotslings and for $20 you can't go wrong. You already know how to use a pouch so that may be the way to go. I'd buy a maya ring sling over a maya pouch tho. I don't have the pouch but I've heard that the zippers can be a bit bothersome. The ring sling is wonderful for nursing in and I still carry my 30 lb 16 mo in it. HTH