I had to tell Charlotte that the boobs were getting sore now, and tired, and cut down the length of her feeds first.
She also went through a phase of "cuddles, but no feeds" so I would get the boob out and she would cuddle it and every time she went for the latch I would again say, no boobs sore. cuddles only...

I have times I really can't stand the feeling of BF so those times, I feel like I sound horrible, but it works, is to put on the "ouchy" face, a sharp intake of breath and ow ow ow and make moves to break her latch and tell her they are sore. She usually stops and says "poor booby" and that is that. After a while she stopped asking all together.

Good luck hun. Perhaps you could get in contact with a LC to help? And I think you should call the ABA helpline too, they are excellent.
You are in Perth aren't you? If you need anything let me know