Best amp for VonSchweikert VR5?

I had my system optimized for the VR4's before I had Albert upgrade them with new VR5 components (including new drivers, crossovers, wire). Now with the new parts including soft dome tweeters I seem to have lost some immediacy,definition and detail. I think my Plinius SA 100 is part of the problem, it seems to be a little soft in comparison to my old Sumo "The Nine". My system includes VSA VR5, Plinius SA-100, Melos MA-333, Sony SCD 777ES, Audiotruth Argent biwired, Purist Elementa, JPS Superconductor+. I listen to anything from Mozart to Metallica, with a HUGE interest in the BLUES. Albert has had good luck with the digital Bel Canto amps. Spectron,Rowland,Krell,GamuT,McCormack, may also be a consideration. Thanks for any input.