Audio Research REF 110 or Ref 75

I have an ARC VT100MK2, and a pair of Wilson Watt Puppy 6.
Considering upgrade and was wondering what I would gain buy either of these amps. I have all ARC pre / CD and transparent cables.
What I would like to gain is a bit more control in the low end. A tighter bass punch if you will. While still maintaing the liquid tube sound in the mids.
I listen mostly to classic rock and jazz at lower volumes ( around 80 db ) sometimes I go louder. I considered a solid state amp, but I do love the sound of tubes.

Thank you