Try dry firing (with a handgun you checked for unloaded status 3, 4, 5, 10 times) at a safe backstop and see if the sights shudder as the trigger breaks.
If so, there's something wrong with your shooting technique. Not being there, I can't say for sure what is making the hits go low left. You can work on technique by dry-firing and save a lot of money in the process.
Edmund
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