I'd second the cartos. Boge LR 2.0 are very forgiving and will let you squonk without overflowing into your mouth. When the draw gets tight it's time to switch to a new carto. Just remember to prime them before you fire the cartos, otherwise you'll get the most terrible taste in your mouth and the carto becomes unusuable (burnt). Check out some of the videos on youtube on carto priming (just search for the carto condom method). I know you can get away with just dripping the filler, but this way you'll be certain.