Booming bass from WP6

How close to the room corners are your PUPs? If the back of the woofs is within 1-2 ft of the corners, you'd need to bring them out another 1-2 ft. Be sure that the distance (from the spkr front)to the corners & to the side walls is NOT equal. Your imaging should also improve.
Also, if the PUPs are not up on spikes/cones, try elevating them so that the bottom is minimum 2 inches off the floor. Temporarily, you can use non-resonant objects like books or reams of paper to support the speakers.
If possible, cover the bare floor between the spkrs and your listening position with a rug.
Happy listening!

If your condo has a common wall with a neighboring unit, you may actually be hearing the booming sound of a broom handle being pounded against the other side of the wall.
It took me a while to identify the characteristic leading-edge "slam".

It's probably true. Your room is too small for the WP6. A speaker that size really needs room to breathe. I wonder how the cubs would sound in there though. Small rooms need small speakers. I doubt that any full range floor standing speaker isn't going to come off sounding "boomy".