Need Amp Recommendation

I'm auditioning Rockport Miras which I like, but the upperbass/lower midrange could use some weight. I'm driving them with Theta Citadels, but for fun I grabbed a VTL ST-250 from another system and tried it. It provided the midrange weight I seeked, but it suffered in other ways (highs a little closed in, bass not as tight).

Wondering if anyone has any suggestions for a SS amp with great midrange, or a tubed amp that would do better than the VTL ST-150.

Thanks.