If you haven't tried it yet, you might experiment with room placement. A lot of the bass you hear is coming off the walls, so pulling the speakers out may reduce the overall bass a bit. As you get closer to/further from the walls, the frequency range that is being boosted by room reinforcement will change, as well. Simply shifting this frequency may also help with your issue. The results can be quite significant.
Also, it's free, so it's definitely worth a try, IMO.
Also, it's free, so it's definitely worth a try, IMO.