just get an 18c, and keep spraying- the only darkness will be during reloads
just kidding, ask savage (I harassed him for days with glock questions and he kept answering them, got me a g22 just recently but have no light to test out the hiccup issue). one thing to remember is recoil thrust and duration very quite a bit from what you can actually percieve, and it makes a great difference from one load to another, on the cycling force and speed of your slide/magazine feeding relationship. if it doesn't work, try some new ammo.