I don't think anyone can help you without the stamps on the front. Michel writes that the perfins are in original size. I don't think there is another solution (after sorting by shape) than to measure them and compare them with those in the catalog.
You can try this experiment. Scan the Michel page with the POL's. Invert the colors with a graphics program. This will make the holes white. Print out. Then you overlay your stamp on each image. The one(s) that makes all the holes in your stamp white are a possible match.
It should work by just laying the stamp on the Michel page but I think it is easier to line up the holes when the holes are white also.