Fatigue reducing interconnect?

As the Michigan economy has been rough on the restaurant biz (and a large percentage of responses have dealt with speaker placement) I began to experiment with what I have rather than spend more. I found that by toeing the Energy's out a bit-they are actually straight, but seem toed out after previous positioning-the harsh highs have largely disappeared. Sound is still alive and detailed, but not irritating. The other thing I did was to play the system almost continuously over the past 3 days, as I began to read about IC/cable break in. While the other components were seasoned, the wires were new and had less than 50 hours at the time of my post. Not sure which variable (or both) had the effect, but the sound has much improved. Thanks for your suggestions--I have learned much.....

After more experimentation with speaker placement/room changes, I have concluded that good recordings (James Taylor's 'October Road', Chris Botti's 'Italia') sound great and poor/bright ones (Boney James' 'Sweet Thing', Earth, Wind, and Fire's 'Vol.1') sound harsh and fatiguing--regardless of how the room is arranged. I assume this is simply the result of a revealing system "doing its job". While there are much more costly electronics and speakers than mine (which I surely will aspire to later in my journey), am I to assume they make poor recordings sound better? If not, it seems, purchasing quality recordings is as important as anything that follows. Also, it has been suggested to me that using digital cables will help reduce high frequency harshness while maintaining the overall sound quality. Seemed odd to hear, but has anyone experimented with this?