Anyone have Bookshelf speakers mounted over top of their subs??

I do not disagree,  I have a room treatment ordered, and I am going to build some bass traps myself, or GIK is a local business to me, so I can pick some up there. Right now the one sub I have is sitting midwall and my room is not ideal, so there are some nulls and some boominess. Hopefully the treatments and traps will control the boominess.im not sure how they affect the nulls though.

Unless you're using room correction, this almost certainly a bad idea.  I'd always place the subs for smoothest bass and the mains for best imaging.  If you just make sure that you're crossing low enough from sub to main to eliminate subwoofer directionality, you won't be trading away anything (except appearances) with asymmetrical placement.

I have the sub set at 80hz so directionality isn't too much of my concern, it's more of filling in the nulls, and having better overall sound. I may try facing the 2nd sub directly at the 1st sub on the opposite wall. My room is 11x19 (sub on the 19 foot wall) but there is a stairwell, and a 5 foot entryway to the kitchen,  so sound waves are escaping like a death row inmate. Plus i have wooden sub floors. Not a great scenario, but it's what I'm working with. 

Have you tried the inverted process ?

If you lack measurement tools, which IMHO are essential,  you can put the sub where you sit, and you walk around the room until you hear the best bass. Then swap you and the sub. :)

I did this years ago using Totem Mani 2's with 2 NHT sub two subwoofers. Worked very well. You might not have the ultimate degree of moving the speakers around for the best performance for both the sub and the main speakers, it worked for me