My opinion is ANY plastic framed .40 is gonna buck. My SW-99, my SIGMA, my Glock 23-they all buck and snort. Simply selling your SIGMA and buying another .40 might not give the results you want. As for trigger pull weight, enough dry firing will eventually help make it better. Remember the SIGMA is not a target pistol, its a good, reliable self defense piece thats highly underrated IMO. If your wife is recoil sensitive, you may have to go with a 9mm to ever satisfy her. My wife shoots lights out with her Glock 26.