Upgrading from Adcom GFA 5802

Hi everyone. I'm a long time reader, first time poster and would like your opinions for a new amp. I mostly listen to prog rock Genesis, Yes, etc. I have the matching preamp, big energy speakers, good cables, etc. I like the overall sound of the 5802, especially the base, but the high end seems rolled off and I would like more transparency. My dealer suggested the Krell KAV 250, which made sense. However, it sounded too controlled almost mechanical in my system. Next, I tried a pair of BAT VK-200 monoblocks. Transparency and highend extension in spades. But not enough low range punch-for prog rock anyway. Now I don't know what to do. If any of you have had a similar experience, I would really appreciate your help. Thanks, Matt.......