most handguns are factory zero'd at 25yds. most likely the magazine being new and stiff if it keeps up try a new mag. yes it can but better to practice grip than too depend on a mechanical advantage too control recoil as you may not always have the light on the gun. hope that helps and remember...
sometimes i switch too my glock 26 almost no difference in weight and just a bit in size its more of a whatdaya feel like choice than any real need when i swap out lol!