If your mains are rated to ~44Hz anechoic, then they cab be benefitting from some room gain, as well. That, coupled with the subs crossover set way to high and you'll have a problem. For proper handoff from the mains to the sub, you'll probably find that the crossover will be much lower than what it is now. Probably something in the ~30's Hz range. In addition to that, if you get the crossover set properly, you can then increase the volume a click or 2 to aid in finding the lower bass notes that you might not be hearing now. Try that after you get the crossover finalized, though.