I'm using a ONKIO 9555.
I've placed them about 8in from the wall, and wow! not only the boominess is dramatically reduced but there also seems to be more overall balance. great!
to be honest even at the dealer I remember of finding the bass a bit to much, wouldn't quite say boomy, but a bit too much for my taste. I read somewhere someone comment that bi-wiring them cured this "boominess".
to be fair it also may depends then the audio files - I'm using a mediocre notebook to a DacMagic via usb, and RCA cables to the amp as the it only has analog ports. my apology
I suspect the floor is the worst culprit here, I'm definitely gonna consider these stands
thanks all for the much needed help