i would have no clue about amber wing, but i went from a 128 which was way too small to a 135 (which was suggested by another female rider who was shorter and a bit bigger than me and rode a 135). I REALLy like the new board though. i still don't get enough pop off the wake, but i'm pretty sure it's my technique...i am too new of a rider to really be giving advise though
Also, i was told the bigger the board the more forgiveness you'll have when you land. Hope this helps.