If you still using the Snell C/V - this speaker has "underdamped" woofers (usual bass hump). The damping factor of the amp will play a considerable effect with this design. There is nothing wrong with your Dreadnaught but it is a low feedback design and may have higher output impedance and therefore lower electrical damping than your old Bryston. On a different type speaker design this difference would probably be negligible but as it is you are probably hearing slightly "less woofer control" on a speaker that already accentuates bass.
Since you don't like the precision/imaging of your previous amp (Bryston) then you might consider changing speakers and keep your warmer sounging dreadnaught. Choose a speaker with a critically damped design and you may be very happy. Choose something you like the sound of and avoid Snells, Watt Puppies and Proacs or any other designs with the characteristic "bass hump" of an underdamped design.
Since you don't like the precision/imaging of your previous amp (Bryston) then you might consider changing speakers and keep your warmer sounging dreadnaught. Choose a speaker with a critically damped design and you may be very happy. Choose something you like the sound of and avoid Snells, Watt Puppies and Proacs or any other designs with the characteristic "bass hump" of an underdamped design.