I would start by checking to ensure the shooter rod is centered. Then check to see if the plunger tip is on straight. (Twist the shooter rod to see if the tip looks like it's wobbling). If those are both good, the next step I would check is to ensure a medium+ powered plunge has the ball rocketing past mechagodzilla, likely hitting the bridge, give or take.
If that's all happening, and you're just seeing lightly plunged balls hitting the right wall, then bouncing left into Mechagodzilla, I would suggest it's all to do with that ramp.
I had luck today by removing mine, using a pair of needle nose pliers, covering the ramp with a cloth to avoid scratching it, and then straightening the bend in it. Then I bent it back, but not perpendicular to the ball path. I started the bend on the left side a little lower than on the right side. The idea being that as the ball travels up the ramp, it would have more resistance from the right side, keeping it off that right wall.
Hope that's useful? (ie: bend the ramp at about a 30 degree angle. and only a very slight bend.)