So, based on your BP analysis local derbies did not give any team any advantage to the stronger Aussie teams. Good work. I was wrong on this point.
It does show NZ sides score more 4 try bonus points against non-NZ sides and that Aussie side concede more. Thanks for confirming what I though on the issue of the Aussie sides being weaker.
Wins are what matter most of all.
Specifically wins against team outside of your conference.
That is the main issue because a win is worth 5 points.
Bonus points are icing on the cake, and if you now how to win, not as important (ask the Stormers)