Background:
I own a CZ-75, a SIG-Sauer P229 (.40 S&W), and a SIG-Sauer P220 (.45 ACP). I recently picked up a Glock 19, because:

1) Can you really build any kind of collection, and not include a Glock? It's like a guitar player/collector not having both a Fender Stratocaster, and a Gibson Les Paul.
2) It feels amazing in terms of allowing for a natural thumbs-forward grip.

Took it to the range, and my grouping is great. All within +/- 1 or 2 inches. My consistency is great. But, all of my shots are landing directly left of target. Elevation is perfect. I'm inclined to think this is because of the different trigger feel on the Glock, and that despite my best efforts, I'm not doing an even, straight-back, smooth motion pull.

The 19 has fixed night sights, and another shooter (who primarily shoots a glock) was on target, so while I suppose I could have the rear sight drifted right, I don't want to compensate the sights for me, when it appears I am the problem.

Any tips for transitioning to a Glock trigger from other pistols, that would improve my accuracy?

As always, thanks!

Mark