I fought with adjusting the Pinbot so that the ball would reliably go up the spiral. Finally this helped me. For me, the ball was rattling off the left and/or right of the shooter lane even before it left through the gate. I couldn’t easily see this with my eyes when I shot the ball.
I finally used a cd case lid and held the thin side against one of the shooter lane rails and shot the ball to feel where the ball was leaving the center of the shooter lane. Hand rolling the ball up the groove in the shooter lane did not cause the ball to touch the CD case but I could feel it touch when shot the ball with the plunger. I started at the bottom of the shooter lane; if the ball hit the CD case lid on the left side, I moved the shooter rod slightly to the left; if the ball hit the CD case lid on the right side, I moved the shooter rod assembly slightly to right. I can finally can shoot the spiral 100% and the adjustment took less than 15 minutes. Try this if you having difficulty finding the “sweet” spot for the shooter assembly adjustment.