Uhm,? why not just turn that little screw that adjusts the trigger sear on the lock?
There is a little spring held screw that adjusts how far the trigger sear sets in the tumbler inside the lock it's self.
The hard part about this simple adjusment.(oxymoron!) Is that the lock needs to be removed and the screw adusted each tyme you want to make a change.(or untill ya figure out how to push the trigger sear while the lock is in your hands:) )
this little screw will move the depth that the trigger sear "seats" into the tumbler cam slot. If pushed too far, you will lose the half cock saftey ability of the lock,,if it's set too far back,,you'll get a heavy trigger pull.
The PITA of this traditions/cva adjusment is that it will change during shippment or transport or temperature changes. It's just one of those things a feller needs to keep on top of. a constant adjustment. well good luck