I am new to all this so I am assuming by a sub crawl you are talking about moving it all around the room and seeing where it sounds best?
Actually, you put the sub in your primary listening position and you crawl (or walk stooped over very low) around the room and find the spot - or spots - where you get the most output. Then you place the sub in the spot that works best for you (ideally the one with the most output, but sometimes life gets in the way).
I played the bank scene in Matrix and you cant really feel the bass unless I turn the gain way up on the sub itself. I also set it up according to the yamaha and paradigm instructions.
Gain controls aren't necessarily linear, and they work differently on different subs. So you may in fact have to turn the gain on the sub up fairly high. But once you've run the AVR's calibration program and adjusted the subwoofer level as required/desired via the AVR's speaker set-up menu, you should have a balanced sound. Turn up the volume and you should get bigger, but equally-balanced, sound.
I think I might have to consider taking this sub back.
No point keeping it if it doesn't meet your expectations.