I am shooting a 2011 style pistol, 9mm major, running sti magazines with grams springs and followers (just replaced). Using both old and new style magazines (with and without spacers), I am having an issue where the bullets nose-dive inside the magazines and don't feed properly. They ultimately end up almost tumbling, and when I turn the magazine upside down, several bullets just fall out before the spring re-engages and pushes the rest into position. I can't figure out what is causing this and it's very frustrating, especially because its causing major gun malfunctions at matches. Magazines are cleaned before use, and in between stages. Still having problems. Any advice would be very much appreciated.