Great question! It's been bugging me that I've owned it for almost 2 years and hadn't cracked the top 10 high scores on it here. I was holding at 104,000,000+ for over a year. So I've been adjusting it over and over - the pitch, the level, and the upper play field trying to increase hole in one accuracy + frequency.
My tilt is on the loose end but still on. The only thing I did this week was I finally changed the special to award an extra ball. But ironically enough, I had scored over 117,000,000 on ball 1 the other day, receiving the EB for completing the 4th hole and I think the 2nd hole awarded me the outlane extra ball on the left. So technically the special extra ball award didn't really help me much but it did get me at least 1 more maybe 2 extra balls. I completed 18 holes, then another 15. Course completion bonus was 20,000,000 I believe, or maybe 10,000,000 - I can't remember. I literally played 50 games in the last week trying to beat my 104,000,000 score and it finally happened.
But I'll be back for more. I want 2 course completions and want to crack 200,000,000 now.
For any high scores I go for, that's how it usually works - I set a goal and "Gofer it". Once I hit that goal (beat my old high score) now the goal is a 2nd course completion and 200,000,000 so that's what I'll be working on all week / month / year till I get there. You'll notice I have quite a few amazing scores for games on here. My most recent amazing one was over 400,000,000 on SWEP1 with extremely tight tilt and all factory settings, and it was witnessed by 2 other people. Once I get in that zone, and I mean really in the zone, sometimes I even surprise myself with how dialed in my shots can be.
P.S. - also make sure all switches are working and registering - I had one in the outer orbit not working for months, never realized it, but it was responsible for increasing bonus X as 2 switches need hit in the orbit for that, not one. So that high score included my highest bonus ever which was around 15,000,000 on one ball alone - the switch had just been fixed about 2 weeks ago so I suspect that also contributed greatly.