Cables will help but I"m not sure to what extent, so people who have compared the Nordost Frey2 and Heimdall2 power cords and TQ2 Black speaker cables to other types may be able to provide some insight. The problem is whether the change in sound with cables will bring the impact that you seek.
I don’t have experience with Nordost power cords but use Acrolink top range cords and they sound like what you have described. If you are able to borrow some it may be worth a try. It’s a full and robust sound and smooth at the top with a tube-like glow in the treble. They are costly but used may just fall within budget. 8N-PC8100 or Mexcel 7N-PC9900. Personally I would try power cords on the Vitus and source/DAC first. WIth the wrong cords, music can sound lean and thin, 2 dimensional instead of 3 dimensional.
Good luck.