The eject from the moat that is draining down the middle, that is a common problem, mine did it as well. The resolution is to either change the coil to a smaller size or shim the coil plunger so it travels less distance, thus hitting the ball lighter, You can shim it at the coil stop with some double stick foam and that will lighten it up. Mine almost never goes down the middle from the moat eject now.
Sorry, but this seems a very odd issue for a MM. The moat eject shoots the ball up and to the left, where it lands on the left orbit lane and then gravity rolls it down to the flippers. I don't see how the power or stroke distance of the coil would have any effect?
Depending on how the ball bounces up to the playfield, you should either get a ball that rolls right down to the left flipper, or even catches the bottom of the left slingshot (without firing it) and then hits the left flipper. With the geometry of the orbit lane, that ball should never even come close to draining right away.
1)Check that your game is level left to right. If it's tilting down to the right you might get drains
2)Remove the plastics under the upper catapult wireform (this may require removing the wireform too). Once the plastic is off you should see the screws holding down the stainless steel orbit guide (see the lower left of the picture below). One or two of the holes on the tab should be extra wide. this allows some adjustment on the angle of the guide. Loosen the screws and adjust the guide so that the end of it points as far left as possible. You may need to loosen screws further up the guide to get the perfect angle. You'll notice the two screws on the bottom of my picture. The one on the left is almost overlapping the tab. This means the guide is pushed as far right as possible, which in turn forces the bottom of the guide to point more to the left. No more lost balls!
Sorry for the long post. Just wanted to make sure it was clear.