Widening Soundstage

I'd try to get the listening position a bit further away and free from any reflective surfaces. This might require placing your speakers closer to the wall behind them, which may be challenging for the bass (EQ perhaps or experiment with a sub).

With what you have, I agree with Shadorne. Your listening position might be too close to the speaks and things might open up better with more distance. Play with the position of the speaks relative to your listening spot carefully. A few inches could make a big difference.

Also that open door behind the system could be sucking some of the life out of the soundstage. Try to keep it closed.

You might try to do more acoustic dampening of the side and rear wall also to help with the near field listening, but it looks like that could be a major project.

Try the omnis. If they don't work, send them back or buy them used at a reasonable price and resell them.

Trading the Sason's for Omni's is not worth it IMO. Try working with the room and speaker placement. What are the dimensions of your room? How close is the listening position to the back wall? How far out from the front wall are your speakers?

My room is not an ideal shape and I've been able to optimize it so that it has a nice 3D sound stage that extends out beyond both speakers. Could it be better - sure - but not until I get a bigger and more symmetrical room.

If your speakers are toed-in try them more straight on. Like Shadorne also suggested either move the speakers back a bit or your chair to be farther away.

The thing I have found with difficult rooms is you can either invest in treatments and go to great length to fight the room that you have to live and listen in or you can adapt the strategy of letting the room work for you rather than against you.

My conclusion from having used both omnis, planars and conventional box designs in various shapes and sizes of rooms over the years is that omnis will fill the room with sound more evenly and with greater ease for you in assymetrical rooms than more directional designs.

Thats not to say that placement doesn't matter with omnis because it does, but omnis just tend to work with the room more naturally than do more directional designs.

The OHms are acatually not completely omni, the top is covered by a more conventional wide dispersion soft dome tweeter angled inwards 45 degrees, which helps retain the naturally wide soundstage of the omni Walsh driver that covers the rest.

The soundstage almost always naturally extends completely to the side walls both left and right even if the speakers are placed more closely together and located either significantly right or left of center.

Toeing the OHMs outward to point the tweeter more directly towards the listening position can be used to reduce the width of the natural wide soundstage if needed. When properly set up a couple or few feet from the rear wall, the sound stage will also typically extend back well beyond the rear wall on good recordings.