Father having trouble wearing 2-week-old

Hey folks. We have a baby Bjorn mini, a solly wrap, and two-week-old (10lb 22") girl. I'm a tall thin father (6'2" 188lbs).

The problem I'm having is that I've gotten the girl into both carriers on my chest, but she doesn't seem at all comfortable, and it feels to me like there's a lot of tension on her legs. I've been really careful to make sure her legs are in an M shape and everything, but I'm starting to wonder if my body shape just isn't right for carrying her at this age. Is 2 weeks too young? Does body shape matter? Does she just need to get used to it?

Thanks