I'm confused as well but i'll take a stab at understanding and answering.
If you have games set to 3 balls and you want to make 3 different tiers like top 500 IFPA ranking play the pro score, 500-2000 ifpa ranking play the average score and over 2000 ifpa ranking play the Novice score.
If that's what your trying to do there is a bit of guesswork in it.
For AC/dc i would say a novice pin golf score would be 8 million, average pin golf score would be 15 - 20 million and a pro score would be 30-40 million. Depends on how tough the game is set up.
personally i like pin golf objectives to be non-score based. For ac/dc the novice objective might be starting one of the multi-balls, average objective might be getting the play field to 3x scoring.