Sara,

Sometimes Ava STILL comes off and my nipple is pinched or ridged... left one (flat one!!) seems to often have a pinch in it but it doesnt hurt when she's on so i dont know shes doing it and my R nipple often has a ridge in it like its raised a bit.... i dont know what we're still doing wrong but it doesnt hurt as much anymore.
My Right nipple (badly damaged one) still hurts when she attaches but no way near the horrific pain it once was. (as its healing)
I think some people might just have one "bad" nipple i know someone who is BFing and has been for 6mths and still has a 'sore' nipple side. but I think with time it gets better and toughens up.
You can do this.... keep persisting if this is what you really want you can do it.
I've been persisting and I'm still BFing and now enjoying it more..... much more.
You CAN do this...... I know you can because I've been where you are (and still am there kinda).....
I think as Ava has gotten older, she is feeding more effectively and latches on better as she now knows what to do.... babies are learning to. They get better with it too.