A few notes here,
swatSurgeon, many techniques will work, some are just more efficient than others. While it might be nice to have both hands equal, there’s always going to be a “weak” hand.
Smoking Joe, I’d never slam a slide on an empty chamber, this can cause damage to a handgun, on the other hand, I always slam the slide shut with the slide release to load the handgun. This ensures proper bullet seating every time. If the gun cannot handle it, then its time for a new gun.
On proper gun handling never “ride” the slide forward when loading a round, this can cause the round not to seat properly. This also takes up waaaay too much time, time I’m not wasting in a gunfight.
Sorry to hear the lefty problems you’re encountering woth the Glock, I use HK USP’s for all serious work, and even if I were lefty everything on a HK can be switched to the other side.
TS