Here's the thing:
Despite the science, you'll never convince either camp that downloading mags, or loading to capacity, or letting them sit isn't the answer. Anecdotal evidence always trumps scientific research - every time.
So, they are your mags, so do whatever makes you happy. You won't hurt them no matter what you do.
I have to ask though, why are you loading a full mag into your pistol with the slide closed? If it's on the range, shoot until slide lock then load, or if it's in competition or training and tactical reloads are de rigeur for that section, then use a mag with one less round in it at that point if you find it helps. At home, when loading a full mag into a pistol, it's not necessary to have the slide closed to do it, so why risk deforming a round?
