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What kind of sight picture are you using? I don't have a Hellcat, but when I got my Sig P290, I constantly shot low. Found that I was not using the correct sight picture. I was trying to use the center hold sight picture, where the top of my sights would split the target in half. I then learned that the Sig pistol was set up for "combat sight picture" where you align the dots on the front and rear like normal, but you cover the center of the target with the dot.

Not sure if that is your issue, but just a thought.