Rex
Dignified but Approachable
That's the classic symptom of playing at gig volume on tones that were dialed in at bedroom volume. Try dialing in at gig volume before you give up on it. You'll discover a whole different world.When I play at band volumn the gain on the high end is some how affected, like it has less gain and starts to sound shrill and harsh with un-natruaul artifacts in the sound. At room volumn, I love it, nice and warm sounding.
One other possibility: you didn't mention what comes after the power amp in your signal chain.