Best speakers small room off center

I could use some advice/help with my secondary system in my office. It measures 11 by 13, and the speakers are along the short wall, but they are off center. They are only about 5 and half feet apart and the right speaker is about a foot and a half from both the side and back walls (the left speaker is a foot and a half from the back wall but well off the side wall). I am centered between the speakers, about 8 feet from them.

Right now the weak link in the system is the cabling, but before I get into those details, I want to make sure I have the major components set. Current speakers are Energy C6. Rega Planet 2000 CD, Adcom GFP750 preamp, Bryston 4Be (early NRB series) amp. The speakers need to stay were they are. Are these a poor choice for this application? They don't image as well and they're not as clear as they were in a much bigger room with more optimized placement. Price range is 700-1k used. I'm not picky about box, planar, etc. Other threads on small room speakers suggest monitors, which I could do if I had to, but I see kids in this office who might knock them over, so I'd really prefer floorstanders.

If these speakers are a good choice for the set up, I'll think about cables next, but if they're not, any advice is appreciated. Thanks. -Dave