UPgradeing dedicated line components

Six months ago I installed 3 dedicated lines for audio. One to amp, one to preamp, and one to digital. I used standard solid core 10ga romex for amp and 12 ga otherwise. I have a Square D box with distance to outlets not more than 20'. Used hospital grade outlets, however inexpensive ones.

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.

Thanks in advance for any thoughts. Mike