Very long time since I used my ATAC pedals. The cleats, or at least my aged cleats, are not symmetrical. If memory serves it was 5 degrees rotation to unclick in one direction and 15 in the other. Move the cleats from left shoe to right shoe and the long swing is on the other side. Do you have any available rotation in mounting the cleats? I had my cleats on two different pairs of shoes and they were not same. What I am suggesting is you try rotating the cleat so that it becomes firm as soon as your knee begins to drift. Not sure if any of this will apply for you but if it does worth a try.