In reference to "trigger slap", that is not a mechanical defect more so than a training issue.
When you as the shooter pulls the trigger straight to the rear and the pistol fires, don't take your finger far enough off the trigger that it completely comes to its initial/full length of travel. Control the trigger by allowing the gun to fire, then (doing so slowly at first), allow the trigger to come forward only just enough to allow the sear to re-engage, and no more.
Now you are at the point you can either pull the trigger to the rear, with a shortened length of pull, or you can come all the way off the trigger and start over at the beginning.
In practicing this trigger control drill you can often hear the sear re-engage, and feel the trigger/sear re-setting.
Now rinse and repeat a bunch of times and I am betting that the "trigger slap" problem goes away on a whole bunch of different guns.
That may not have been verbally explained in the most descriptive way, but there are probably no shortage of online videos that can be watched explaining trigger reset. As an added bonus, the very vast majority of people find that their accuracy improves once they begin to control the trigger in the manner explained above.
Hope that helps.
