If you are already @ +6 bass, then I suggest you go by what George suggested....get a sub.
Read this long answer only if you are willing to play around with your speakers before jumping for a sub.
Problem: You have placed the speakers in the corners.......good for boom (not bass overall) but bad for overall response of the speaker....somewhat closer to the 'Clarity' you are referring. The 8" woofers are crossed @ 4500hz, much higher than what typical speakers would do. So they effectively play the male voice and the thump and thunder in movies from the same driver......somewhat harder to achieve at the same time.
Solution: Do try doing this after moving the speakers towards front (at least by two feet if possible).
- On AVR, set the front speakers to 'large'. Change the distance according to your seat. This also has an impact on how the sound is 'projected'.
- Increase the tone (Bass) to +2 and then inside the individual speaker equalization, increase the 65hz by +1
- Decrease the 150hz and 400hz by -2 each.
- Treble tone adjustment by +2.
The Bass feature on your AVR bumps up 50hz and if you are doing it +6, that is way above what the speakers could take. Note there are very few songs which have good use of 50hz notes and below [jazz (double bass) and rock where good use of kick drums is what I can think off). So basically you want more bass but you are bumping unrelated frequencies.
If all this does not satisfy you then go for a sub.