George, although my personal opinion of MIT cables differs from Aball's, he apparently knows your speakers and I don't. My advice is don't ignore anything said above, except that which I take it you have already ignored. If you are interested in cables, read through some of the threads here and visit Audioasylum's cable asylum. Lots of do it yourself (DIY) ideas there.
You don't say anything about your source (e.g., cd player), but as was said above, start first with speaker placement. The position of your speakers, their relation to each other and to everything else in your room that will reflect soundwaves, including, but not limited to floor, walls and ceiling, will have more of an impact on bass, soundstaging and imaging than anything else you do. Just experiment.
If you can't move your speakers because of the configuration of your room or the veto power of someone else with whom you share your room, you may have to be satisfied with the bass, imaging and soundstaging that you have now. And if that is a significant compromise from the best sound that your speakers are capable of delivering, I would not waste my money chasing after cables. No cable is going to make up for a real problem in the way your speakers interact with your room.
Have fun.
Paul