Moving up in the REL line of subwoofers

Anther vote to call 'em. I did and they were very helpful. Refreshingly so.

Moving subs around, AKA pragmatic room coupling, could be it (you will get more magic). But more subs at different crossover points (as I understand it) oh heck yeah to that too. Most folks who got 'em love 'em.

Goggle pragmatic room coupling and it's easy to understand why.

All very interesting information. Thanks so much.

To those of you trying to help the OP get the best sound with what he has, I’m not sure you’re understanding the ‘itis’…. 

Move the subs from front stage to the back wall...or along the sidewalls behind the seat. The 2 subs sitting up front (for your viewing pleasure) didn't do some worthwhile things for your room, perception of deep soundstage, envelopment, etc

Lack of long sub cables would be a reason for subpgraditis

I’m not sure you’re understanding the ‘itis’…

???? Please elaborate.