Smoother bass by running woofer out of phase?

In my dedicated room that is furnish with bass traps, I still get to much bass energy on bass heavy music. I discover recently that in bi wiring my speakers (ML Vantage)I wire the woofers out of phase;the bass bloat goes away and I have greater detail from top to bottom. What is the explanation of this and is this a recommended "fix" in dealing with excessive bass? Thanks, Sam