Hey Juanton,
JJP EE here. I have found that the problem with the shooter lane can be solved by actually lowering the strength of that coil. We have the one in the office set to 8 (yes, 8), and it pops out every time without fail. I have also adjusted our bracket down there that puts the ball in the lane, but the lowering of the coil power really helped out this game. And regarding the timing of the 3 ball lock, I would start by lowering it.
Eric