A few things with the Sigma:
When on the range, load only 5 rounds at a time. This will force you to take a break.
When releasing the trigger after the shot is fired, release it only to the point that the striker "resets". You will hear / feel a "click". Do not release it any further. Take the next shot. You are not preloading the striker when doing this.
Of course, follow the steps of good shooting.
Hey, you were right! The follow up shots were much easier to manage. It took some getting used to; not letting go of the trigger all way, that is. Now that I'm way more consistent and accurate with it, I realized that it shoots about 6 inches low at about ten yards. Only the rear sight is adjustable so I have to aim a smidge high. Oh well. At least now I'm loads happier with the weapon and no longer feel inadequate with it. Thanks again for the tip!
I purchased a Sigma 40ve several years ago. The trigger pull was about 12 lbs. which I knew it would be when I bought it. The Sigma will let you know if you have any flaws in the way you shoot. It sounds like the OP really didn't have a good shooting technique at the start & the Sigma quickly made it evident. I believe most people who hate the Sigma either never shot the older service revolvers which it is meant to mimic, and/or never learned good technique.
These days guys buy a gun and go straight to the range with no training & don't even take the time to strip the gun and remove the packing grease that the manufacturers use to keep it from corroding. Then they wonder why they have ftf's "out of the box" and can't hit the broad side of a barn. I'm just saying...