I know what you mean. The TI Jazz Rounds have the perfect tone when they're fresh, and then they mellow out of bit. For me though, maybe it isn't as quickly, or a bad thing. I've had the same set on my Stambaugh 6-string for maybe 5 months now and they still have a very useable, awesome tone. I've been playing a little heavier and more towards the bridge lately and I think that helps bring out that growly, edgy tone still. I'll probably keep them on for another month or two.
