The fronts being bipolar are meant for people who really want that sound. They're not a typical speaker for home theater, as they add their own ambiance with the rear reflections coming out the back of the speaker, reflecting off the front and side walls.
The average direct radiating speaker will not be bipolar, so I don't know that you need to move to orb audio unless you want architectual speakers like that.
A picture is worth a thousand words, so you should really draw one and upload it, so we know what you have to work with. It's tough trying to picture it from your descriptions, and know what your concerns are.
Surround speakers in 5.1, especially with your couch against back wall, will need to be to your right and left, mounted on the side walls.
One subwoofer works best in the most common rectangular room at the front-center much of the time. But its highly dependent on YOUR room, the other front speakers, and where you listen. For all I know, your bipolar fronts, with their placement too close to the walls, and you sitting at the back wall, may mean that the sub SHOULD be in some other location, that's NOT at the front-center.
Set it up, listen to it, play with it, cruise the subwoofer forum, get a sound meter and download test tones and experiment with what works best.
If you find later you don't like the bipolar fronts, sell them and buy something else that yields the least compromises in what's important to you.