@o_holter My posts on the DA-3000 mods are spread out, but here is a link to AA with a summation and photos. Since then I am hearing further improvement after application of Perfect Path Total Contact graphene past to the pin block connectors throughout the unit. That should be done with great care in order to avoid potential shorts.
Feel free to PM me if you want more details, including a hand-written schematic identifying the caps to be replaced in the ADC section.

