Nice camera.

I would try to make another hole, this time a bit smaller, say 0.18 or 0.20mm. I've had some success using small pieces of beer can, and using the method where you first press a small dent into the metal, then sand it away from the other side using very fine sandpaper or a knife sharpening stone. It's easier to control the final size that way than it is by simply pushing the needle through the foil.