You want to replace them with lower impedance caps. They will improve the performance.
I'm using an Audio-gd power supply in my Transporter. For the Touch obviously you need an external. I had a CIAudio power supply back when I had my Duet and it was pretty good, but there is probably better. I haven't used the Welborne so I can't comment. I will tell you though that I have noticed a difference with various DC power cables just as I do with AC power cords. That's something you can also experiment with.