I had the same situation as you. I ended up ordering a custom pair of XXX's and they are perfect (although I may have gotten the ankle pads a bit too thick because they are killing my right outside ankle bone). I went with the double AA heel, and have not had any problems with heel slippage. I should point out that they are still in the process of being broken in. Additionally, since my heel did slip on my old XXX's I got in the habit of underlacing the the 4th eyelets down from the top, which helped a little. Good luck.