If there were a pumping method that worked better than the rest, then I think everyone would be using it. It differs from person to person.
That being said, many stick to the 7:2 method because of the science behind it. You may have seen some threads that discuss it. I remember reading somewhere that the pressure from the rings can cut off blood flow and suffocate the cells. Since good circulation is an important part of noogling, this could be unhelpful.
However, I am not saying that it it what works best for everyone. When I started using NB, I didn't know the 7:2 method even existed, and I was still able to find a routine that worked well for me. I also have good results from hydronoogling, and I don't have the patience to refill the domes that often. But that's just me.
It doesn't seem that breast size would have anything to do with this, again, since it is more about blood flow than anything. I know I sound like a broken record at this point, but I think that is just something that everyone's body responds to a little differently.
Whatever you do, try to stay consistent in it for at least a month. That way, you can adjust your routine as necessary. If you are jumping around between techniques day to day, it will be harder to narrow down what is helping and what you could do differently.
