My new Sachi mei tai (got tired of waiting for a Kozy) arrived just in a nick of time -- 4.5 mo dd has a bad cold and needs to be carried all the time. I need to carry her on the front and I'm having trouble getting more weight off my shoulder and onto the waist. I've been keeping her up and tight and experimented with carrying her deep vs shallow. Deep seems best shoulder wise, but I'm wondering if there are any other tricks to distribute the weight better. Also working on having better posture when I carry her; I think this has something to do with it. We've been using a stretchy wrap up until now, but DD is over 18 lbs and seems too heavy for it. I'd greatly appreciate any advice.