Whats the FATTEST sounding Tube amp to warm up Lean speakers?

I agree with much of what has already been posted.  Finding the right mix per budget, I would aim a little higher on the power side to provide the dynamic headroom.  

I heard amazing things about your Amps and i am close to trying your s30.

Usually people use the S-30 with the TSM. The VSM needs a bit more power so the M-60 has been the preferred amp for those.

I have experimented with my system and can say there are amny things that contribute to lean sound.  So the problem may partly be the speakers inherent nature, however there are plenty of things that an accentuate the problem.                        
#1, Teflon insulation on AC power wire                         
#2 Silver plated AC power wire                         
#2a Silver or silver plated interconnects
#3 Poor in wall connection of AC duplex                               
#3a silver plated AC duplex                                                  
#4 Power conditioners, all sorts...                              
#5 Wrong Power cords...                      
Notice all this is about wire.

What about slightly Under Biasing the output Tubes? Would that take some of the "Bite" off?
Would that damage the Tubes or amp or anything else?

may not suit you but the price of ARC ref75’s on audiogon have to be one of the best deals i’ve seen. a truly great tube amp with plenty of mojo.
i’m no ARC fanboy but bought one to try out and very impressed and i’ve had some great amps. btw moving the speakers closer together increases mid bass output just as closer to back wall does the same. i bet you already knew this. good luck