Ok very good. Seems your settings are good. Now, I am assuming you are turning up the sub volume so you get some fantastic knock your socks off low end.
The most critical thing you want to do now is look at sub placement. Hopefully, (depending on your room) you can place your sub in a corner to raise your room gain. I remember when I first got my sub, hell I thought there was something wrong with it. Then I place it in the corner of my room and BAM! There was my low end.
Also, is your sub "popping" on music? or movies? or both?
Let us know where in your room you have your sub, this will make all the difference in the world, depending on placement, you may have to turn your sub down! Follow Axiom sub placement guide as well here.