Firstly, the slightly laid back mids is not an overriding weakness. It is just a very minor flaw. I have also read somewhere in this forum that Freddy Mercury's vocal is really sucked way back into the rear, something that is not really apparent to me in my other systems but is severely exposed in my current set-up. The slightly laid back mids portrays a sense of depth. The in-your-face kind of intimacy is lost but what you gain is a slight soundstage (depth wise).
Secondly, I am not sure that this will happen in your set-up. In other areas where I had a point of reference, I gave my comments readily. But this is one area where I absolutely have no reference point. Part of the problem (if you really can call it a problem) is the recording itself. The other unkowns include the CDP as well as the IC to a certain extent, which could be the source of the problem. No doubt, your set-up would be quite different from mine, as far as the source is concerned. It's still too early to conclude the amp was the "culprit".
Thirdly, I would not trade the overall smoothness and warmth in the presentation for an increased impact and slightly forward mids. I might have been over-critical of a minor flaw that did not really impinge on the overall enjoyment. I apologise if that has caused you anxiety in your anticipation. Sure, I yearn for that little improvement but that would be perfection And I dont need perfection to achieve excellence.