Well, you could try making a team filled with shooters, that's a sure fire way of getting those points totals towards 110-123 point average. I did that once, but I got lots of injuries by playoff time. I had about 7 shooters/scorers in my team when I did that, and I get a score lower than 100 only when I face a team with a lot of stoppers and I have injured rebounders.
If you want to cheat your way though, try DBF editing the player's Chemistry fields in player.dbf.