If you are using a soldapullt from GHers, then I would say that you should be able to pull all the solder out, there is enough vacuum, what you want to do is, when you melt the solder with your iron, really get in there with soldapullt with the iron still touching the pad (Maybe your iron will touch the soldapullt tip, but don't worry, those are really tough). When I began using the soldapullt, I would bring the soldapullt to the pad just as I was removing the iron, since I use eutectic solder, this was enough time for some of the solder to solidify, I was scared of melting the tip, then I started to bring the soldapullt onto the pad at an angle, with the iron still toughing it, and then in a single swift motion remove the iron, tilt the soldapullt vertically up, right above the pad and completely covering it and pushing the button on it, all at the same time.