Help - amplifier matching problems

I own a pair of Aerial 7Bs and am using a BAT VK-30 as a pre-amp, a Theta Miles CD player and a Classe CA-100 amp (100wpc into 8). I love the sound except for the bass, which is a bit fat and not taught enough. Thinking that I needed more power, I purchased a Krell KAV-250a (250wps into 8). After letting the Krell burn in for 100 hours, I did a side by side. The results, I miss the Classe midrange. The Krell clearly controls the bass, does not have that "tube" coloration and is much more powerful. However, it sounds cold and I believe the soundstage dramatically disappears. Can anyone suggest a good match, or should I keep the Classe and get more efficient speakers? Thanks in advance.