However, little bright and too “rocky”.
I suspect that this problem is coming from somewhere else in your system. As you found out, the sonic signature between Trio and Trio XD is not really any different. These amps use Krell's newer sliding bias Class A design and also have a smoothed over upper end (this means the high frequencies are smoothed over and subdued like other types of bipolar transitor Class A amps). They don't actually sound bright/harsh at all.