Transformers
I have a DA10 in the studio and love it for it's transparency, depth, and width when feeding the monitors. For a headphone amp I prefer something more euphonic.
The perceived lack of punch and dynamics are easily explained by the lack of transformers. Transformer thump is what adds that weight to kicks, snares and basses. That same weight will add perceived dynamics very nicely. As the low end instruments kick in, you get an extra lift, more seperation from the previous passage.
If you are into ruthless transparency you will probably love the Lavry DAC's. If you enjoy some nice fuzzy coloration and roundness in just the right spots, you will want to add a seperate headamp, something with some iron in it.
For me, the DA10 headphone amp is too spikey for laidback fun. To get the volume up to where the bottom is satisfying, I am usually hitting 28 to 32 on a pair of Denon 7000. That lasts about 2 minutes before the pain starts to register. I then switch to the couch and one of various vintage receivers, and that usually does the trick.
That Sonnett headamp looks like just the right thing for me. The purity of the Lavry with a subtle transformer tube stage. Wonder if he offers it in Black?