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The group size is about 4" in diameter its a fairly vertical line at 1 o'clock. Its a Glock 22.
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The Glock has a very light frame; much of the mass is in the ammo. If you don't have a very firm grip, the changing mass of the frame may cause some vertical stringing as the guns becomes lighter.
You're doing ok, but the .40 S&W probably isn't the best choice for accuracy training. It has a lot of bark and it's not cheap to shoot. How do you shoot with other pistols? If you really want to put in some range time and work on your technique, a .22 target pistol would be useful.