Ditch the gloves, stand up straight ( I've never understood the "Look at my butt, ain't it cute?" stance ) learn how to grip your Glock and the BTF problem will go away.
If what you say is true, its a pretty damaging argument against Glock. If, during a gunfight, I have to remember to "stand up straight, keep my butt tucked in, not wear gloves and keep a two handed, locked wrist grip on my Glock", its not really a gun I want to defend myself with.
The OP's technique looked fine to me, the gun should run without a problem, I've seen MUCH worse.