kythyn, if you rotate the system your listening chair will be up against the wall which will exaggerate the bass. I would keep the system on the 12 foot wall. Have you set the Tympani's up with the tweeter panels to the outside? If not please try it. toe the tweeter panels in so that they point directly at the listening position. They should be three feet in front of the wall. The woofer panels will block the primary reflection so do not use any treatment behind the speakers.
If this does not work for you look for a pair of 3.7i's
If this does not work for you look for a pair of 3.7i's