How soon did you start wearing LO in the K'tan regularly? I've tried it five times in the past week and DD freaks out every time (for mobile users, she's 2 weeks old and weighs around 7 lbs).
I had heard such great things about the K'tan, especially for newborns, and was really looking forward to babywearing, but now I'm not so sure. FWIW, I also have a Beco Gemni, but it looks like she's too small for that right now.
I have been wearing DD2 in the K'Tan and Moby pretty much since day 1. Just keep trying--something they hate today they might love tomorrow at this age. If she freaks initially, try dancing around/swaying your hips and patting her on the butt until she settles. Sometimes babywearing makes her inexplicably angry and she needs to jiggle around a bit before she will willingly accept her new circumstances.
I used the K'tan right away until a few weeks in when she started hating it. I gave up easily and went with the baby bjorn that she liked. I started using the k'tan again around 4 months, I think, when she could face out (all she ever wanted to do in any carrier).
Just thought I'd say that DD freaked out in the Ergo until DH started moving with it...then took the most epic nap ever. She loves the ergo now, as long as she's in motion.
So I second the suggestion to get moving and see how she adapts.
I have that same one ms.starry! My husband would not wear it though, he only wants to wear the structured ones. I started wearing my son around 4 weeks I believe. The first time I tried it, he didn't like it. He loves it now and seems to take long naps in it.
He seemed to really prefer the mei tai until he had more head control. Then we moved to the K'tan around 12 weeks. I've been using it a lot the past 2-3 wks. With his helmet it seems more comfortable than the mei tai now.