If you mirror the three switches a few things during game play will change for the better or the worse.
If you mirror the upper most factory rollover one, you will be able to start multi ball if the lock is ready and you hit the new PKE ramp. The ball will not go into the lock saucer but will start the mode as it exists to the left lane. If the lock is ready for lock 3 and if you hit the OLD PKE ramp and it travels up past the lower and middle switch it will not lock, but if you can shoot it hard enough and hit the upper most switch as you roll up the ramp it will start the mode.
Also if you mirror the upper most one you now have 2 ways to bring up the proton pack value and get to its max easier and another way of scoring LOOPING.
The lower most switch is used to complete the skill shot after the plunge, add to the PKE value and also complete the required PKE shots during the PKE mode.
I cant say for sure at this moment what the middle switch is for but I think it is just another one the does the same as the lower but gives you a better reward having the ball travel higher. I will need to remove the glass to confirm this.
I think you should bring the middle and lower switch over to the NEW PKE ramp and remove them from the old left ramp keeping only the upper switch.