Quoted from Dewey68:So the diverter should only be affecting the shots up the right orbit, or is it supposed to direct left orbit shots back down the left orbit at times? The way some of my left orbit shots come back down it's like they were meant to do that.
The intent of the diverter is to OPEN to direct right orbit shots into the elevator, and to the upper playfield or the throne. When the diverter is closed (normal position), it is supposed to let the ball pass on by - from the left or right - unobstructed.
The shape of the stock diverter arm seems to be the issue; it interferes with smooth ball travel from the left (right orbits seem to be fine). The issue was compounded by the rubbers on the inlane bumpers - the alleyway is just too narrow to let anything but a perfect shot thru from the left.
If you haven't seen it yet, here is a slo-mo video of the stock diverter arm issue: