Almost impossible is too strong but it can be tricky for sure. In my experience the weakest spot to get consistent hits is dead center as you say. You did try working the sliders underneath right? I mean loosening the nuts and moving the switch brackets? That can be the answer more than bending switch actuators. Behind the bash plate (I call it that - the thing that gets struck by the Ball) are springs that can resist against its moving and keep it from getting stuck back too far. Behind the front strike plate there are two places where it attaches to the bracket through two parallel holes and the spring keeps it straight and absorbs the impact of the Ball but it still needs to push the switch actuators open - think of it as a more elegant version of the safe on Sopranos where the impact from the front tries to push the metal “flags” into and thereby close the microswitch actuators which are normally open. This is the reverse with normally closed switches having their arms pushed away. So it’s a bit counterintuitive in a way. I’m just glad the same mechanism didn’t end up on the Hobbit production model as it was supposed to most of the way through the design process. Anyway, it’s certainly doable. The last software version but one also changed the de-bounce (if that’s right - need Keefer) timing so if your witch was for lack of a better term dialed in before, and then you updated to 6.60 (I think), it might no longer be perfect.