After running your Audyssey calibration, did you check to make sure that your other speakers are set to "small"?
When I calibrate my system, my AVR sets my speakers to "large". After completing the calibration, I must go into the menu and change them to "small", otherwise my sub would not receive any re-directed bass from the other channels. This is an entirely separate menu from the crossover settings, so it could be easy to miss.
Gear: Speakers (Paradigm Reference Studio Series): 40 v4 (front L/R), CC-690 v4 (centre), 20 v4 (surround L/R). PSA XS30 (subwoofer).
Denon AVR-X4000, Emotiva XPA-5, Samsung PN64F8500 (64" plasma), DarbeeVision Darblet DVP5000, PS4, PS3, Sony BDP-S6200,
Apple TV (3rd gen.), Harmony One, Sennheiser RS180