A couple of years ago I acquired a like new CZ 457 Varmint Match Target 22 that the previous owner had lightened the trigger to 1lb. and 4 oz. I'm wanting to participate in a 22 caliber league at my local indoor range that requires a trigger pull of no less than 2.5 lb. I have turned the adjustment screw as far as I can but can't get the pull above 1 lb. 8 oz. I also tried to adjust the sear engagement Any help will be appreciated.