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I have noticed the same kind of control and "density" of sound from KR audio amps, which are zero feedback.  Have you tried this brand of amp?  The one thing that I can tell conclusively about the two different amps is that neither one suffers from bass distortion due to output transformer saturation.  I think this is where the level of control comes from that you are thinking comes from the negative feedback.  There are MANY tube amps with negative feedback and poor bass control and I bet if you look at their distortion vs. frequency plots you will see rising distortion into the bass. 

The one thing that the Lamm ML2 does differently than nearly all tube amps is regulation of the output stage.  They do this with the 2nd 6C33C that is on the chassis.  Even the KR amps don't do this and I think it is having a serious effect on the sound of the amp. 
Cheers,
Brad

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