You mentioned that you just moved. Perhaps the new room has different acoustics than your old one, or it's a lot larger...or both. However, let's give some things a try.
Please check the settings on the sub itself, if you haven't already (which you probably have). Make sure that the cross-over setting is all the way up. Also, you could try adjusting the phase setting (I didn't look at the owner's manual for that sub, but I'm assuming that it has one).
Also, try increasing the output level for the sub on the Onkyo. You listed it at -3dB. I'd say increase that some and see if it helps out.