I had the exact same experience with my Maya Wrap sling and was SO bummed out because I really wanted to wear my baby. I did not find a good option for him until he was 6 weeks old. I got a Gypsy Mama Bali Baby Stretch wrap and it is awesome!!!! He loves it, I love it. It takes a little learning to use it but it is not as hard to use wraps as you might think--and now that I am used to it, it is super easy. I wanted a stretchy wrap because with a stretchy one, you can put in on and then take the baby in and out. But if it has too much stretch, it is not supportive enough when the baby gets heavier (I read all this on
www.thebabywearer.com). So the Gypsy Mama has enough stretch so you can pop the baby in and out, but much less than the Moby wrap or others, so I hear. My baby is around 16 pounds and it is still the most comfy of all my carriers (I also have a mei tai and a pouch). Hug-a-Bub is also supposed to be good for the same reasons, but is more expensive. You can get both at
www.attachedtobaby.com and they have an awesome return policy so you can just try it and see how it works. They also sell a DVD called Tummy to Tummy which has detailed demonstrations of all the carries in all the different carriers. You also might get some tips that would give you more success with the ring sling (although I didn't).
A pouch works well for us now, but I could only use it once my son had the head control for upright carries. He just wouldn't tolerate the cradle position. Now we can also do upright carries in the Maya Wrap, but I never use it because I find the pouch much more comfortable and the ring sling just does not work well for me--no matter how many times I spread out the fabric, it gets bunched up in the rings, and the fine adjustments just drive me nuts.
I also have a BabyHawk mei tai which I like. It is comfortable, but not as comfortable as my wrap. My son loves it. I got it recently, when he had good head control. i don't think I would have been as comfortable with it when he was a newborn with a floppy head, but some people swear by the mei tais for newborns. For me, the main disadvantage of it is that I can't pop him in and out of it. You have to untie and retie, which is a pain. I use it for long walks sometimes if I am not going to take him in and out.
I would get a wrap with some stretch, but not too much stretch. The really stretchy ones will be great now, but won't last when your baby gets heavy.