I'm not familiar with the Jard unit. Is the sear adjustable or just the weight of the trigger pull?
I had a Savage 501F .22LR bolt pistol and the previous owner installed a Rifle Basix adjustable sear. He had it set so light that it would slamfire if the bolt was closed too fast. Simply adjusting the screw a 1/4 turn or so kept the pull light and closing the bolt safe.