Oh yeah, and I just re-did the linear regressions of ORtg and O-DReb%, but this time with respect to playoff teams' Playoff Success Points. Here's the system:
+4 points for making the playoffs
+3 points for winning the quarter finals
+3 points for winning the semi-finals
+4 points for winning conference finals
+4 points for winning championship
+1 point for each playoff win
-1 point for each playoff loss
Using this system, the teams that advanced in the playoffs are rewarded for winning individual series, and those rewards increase as the teams get whittled down. A team that makes the playoffs and gets swept earns 0 points (because they had no success in the playoffs besides making them), and the NBA Champions will always have a better PSP score than the runners-up, who will always have a better score than the team they beat in the conference finals, etc.
So then, looking at these variables and seeing how they correlate literally with success in the playoffs, we find virtually the exact same values as we did before. Scoring has the strongest positive influence on success in the playoffs (.413 CC, .171 R-Squared). Offensive and Defensive Reb% still showed negligible impacts on playoff success (.097 CC, .009 R-Squared, and .134, .018 respectively).