I’ve had the same problem, reloaded Sunlight multiple times, let it play burn-in files for several days, could not get rid of fatiguing high frequency edge. I could not understand all the excitement since Windom sounded much better.
Last night, before giving up and going back to Windom for good, I tried reverting to an older version, chose Torreys, played some songs then loaded Sunlight again, that seemed to do the trick, no more high frequency edge. Now I hear all the stuff everyone is talking about. Not sure if this was just a fluke but worth a try if you are still having issues.