Instead of going for the waterworks skill shot, plunge the ball so it lands in the roll and collect saucer to advance the board.
Shooting Rail Road ramp 5x starts 2 ball MB. Easily backhanded from L flipper. Try holding flipper on return as ball may settle. Repeat.
If possible, start Cash Grab when multiball is lit; Cash Grab is the only mode in this game able to be stacked with multiball
Center ramp all day to go around the board and light locks. Very safe and repeatable. Muliball is where it's at.