I'm arriving late to this thread, but you can definitely dial in GB Premium. I was very discouraged when I bought a NIB GB Premium. It had a bad coil, but even with that fixed, it had tons of airballs and unfair drains. I added airball guards near the tall, left ramp and over the inlanes and outlanes. GB has short, metal rails between the in and outlanes. The ball will bounce over it. With the airball guards, this problem is solved. Then, I added the centerpost mod (you don't have to damage the playfield, it attaches to a clear plastic airball protector) which makes this game more reasonably fair. I also adjusted the VUK coil power for the library and stopped it from ejecting SDTM. Most shots are makeable now, and although the ball does sometimes roll out of the pops, to the left, and come SDTM, it's not a common problem. Plus, you can adjust your machine's legs so that you have a very, very slight right to left or left to right lean, and it may solve your problem. If not, get the center post mod. I've played the Stern video pinball GB, and it's very similar to my machine, I feel.