I've found that the biggest contributors to lack of bass is either 1 speaker wired out of phase with the other, or it's a room-suckout where the position of the speakers in the room and the listening position are essentially out of phase with one another. You might find that moving your seating position forward or backwards in the room, even a foot or so, can have a dramatic effect on bass presentation.
Your subwoofers might be in a better position to positively affect bass reproduction at your listening position than your mains.
I would turn off the subs and focus on speaker/ room/ listening position setup first. Once this gets optimized, then you can add in 1 subwoofer, then the 2nd subwoofer. You'll want a helper to assist so you can stay in the listening position while they move the speakers into the proper position. There are several resources for this including the books from Paul McGowen and the Sumiko M.A.S.T.E.R.S. setup guide that can make this process easier.
Keep in mind that once you start adding in the subs, their settings may dramatically change from what you have them set to now since they need to work with and augment the bass from your mains, not against them. Integrating 2 subs can be quite a chore to perfect, however once completed, the entire system will come alive.
I would suggest looking at putting together a REW (Room EQ Wizard) setup and taking lots of measurements. This can help visualize what's going on in your room and speed up the process.