I can completely understand the constant feeding and sleepless nights Jelly, however it feels like a lifetime ago now. I was always told to feed on demand if BF but it sounds like Flo is being lazy at feeding and therefore little and very often. I am assuming that getting into a feeding routine will help Flo feed better and therefore sleep for longer periods. I really hope you manage to get her feeding for prolonged periods and some very much needed sleep for the both if you.
On the weight front, I wouldn't compare JJ and Flo. Elsie is so much tinier at this age than Riley was and I think it is a girl thing. I think Elsie only weighs about 17/18lb now at nearly 14 months. She did not put weight on quickly, not because she wasn't fed enough but because she is just tall and skinny in her build. Xx
Glad you got things moved into the new house Blob. You have the excitement of your first night in your new house. I hope you get through to sky soon. Xx