Hi there,
I was just wondering how long you have been noogling for? I wonder if you may have fallen into the same trap I and lots of others have of just being that little bit too impatient.
There is no correct height for your breast to reach in the domes, as long as they are covering the circumference of your breast they should be the right size. If you are getting marks that stay on your body for days you are over pumping, the domes are putting too much pressure on your chest and damaging the skin, this theory is further supported by the misshapen foam you have. I noticed that mine started to do that also so I reduced the pressure when I pumped. It's so easy to overpump when you are eager for bigger boobs. It's a good idea to check the colour of your breasts when you pump to give you an indication of whether or not you are over pumping, pink or reddish is fine but if you are getting blue-ish or purple or even blotchy then totally release the pressure and re-pump. When I think I might be in danger of over pumping, I pump to the point I think is enough and then release just a tiny bit of air, this method has worked so far - not a purple boob in sight. It doesn't have to hurt to induce growth, breaking the capillaries in your skin is not going to make for a prettier decolletage. I had to stop noogling for ages because I had overpumped so much and had permanent ring marks and discoloured boobs.
I think, as long as the base of the domes encircles your breast tissue then M's are the right size. It may take a good few weeks of cosistent noogling to see your breast rise in the domes and eventually fill them.
Good luck and keep us posted on your progress