Does she drink from both boobs at feeds Jane? Cos you could always try offering that one first. I think I remember having that with River, sometimes one side would have more than the other, not always the same side. Feeding more from that side is really the only thing I can think of, without increasing the supply of the other side first.

As for wind, well who knows. Perhaps the bottle is creating bubbles that are actually big enough for her to bring up? As well as that the wind situation should be improving as they get older anyway, as their guts mature.