Yeah, I didn't even get my RS until DD was like six weeks old, so it might just be a matter of waiting just a little longer. I'm the same size as you are, so that shouldn't be the issue.
Before that, I had one of those My Breast Friend () pillows, which DH called "the lunch counter", haha. It was great, though, because it strapped around my waist so I could actually walk around with one arm free while nursing on it. I'm sure it looked ridiculous, but it was nice not to be completely stuck.