UPgradeing dedicated line components

I seek input on value of:
1) Upgrading the breakers in the square D box.
2) Replacing the romex for 10ga stranded cable for all lines.
3) Upgrading the outlets to PS audio or something of ~equal value.

#1) There is no upgrading the breakers. Hopefully you have a Square D QO panel and not the Homeline series.
QO has copper plated bus, Homeline has aluminum bus.

All three dedicated branch circuits should be fed from the same Line, leg, of the panel.

#2) #12 wire is plenty big for the preamp and digital for a 20' run. You will not hear any difference changing them out to #10. (I would not use stranded wire)

#3) I can't help you there. I will tell you all hospital grade recepts are not created equal. I am using the Hubbell 8300H hospital grade non plated contacts with a non plated brass backstrap. The recepts are cryoed.

Stay away from recepts that use nickel plating on the contacts and the mounting backstrap. Also you do not want a recept that has a ferrous steel backstrap.

Thanks Jea. I will look into the Hubbells.

You might want to check out the Porter Port.