standing waves

i notice when i stand from my listening position, the bass is fuller, louder, better than when seated. I rearranged some furniture and it helped a bit. Ive got an area rug in front of speakers for first reflection..i just picked up from Accoustical solutions a pr of basstraps...not impressed with these...im pleased with my current speaker location/placement (after a long time of experimneting) not sure what my other choices are. I have a Rel Storm 3 sub..should i put this on a piece of granite? on a stand? thx