I still haven't figured out how Pulse determines the default levels it
forces upon the user at each start of the service.  I think it should
respect those levels set within ALSA/the system.  If Pulse can't respect
selected values, then I'd like to know where it gets its default values.
That way I can manually change them and force my default values down
Pulse's throat.

pactl is a hot mess to understand.  I don't see a way to set volume on
ports at all.  Maybe it isn't even possible using pactl.

/etc/pulse/default.pa
/etc/pulse/system.pa

don't seem to provide help either.  I tried modifying a few things
there, and it broke the automatic muting when switching between
headphones and internal speakers.  So I put all that back the way it
was.

I also noticed if:

1.  I have alsamixer open along with pavucontrol
2.  Set the headphone mic dB gain to 10% in alsamixer
3.  In pavucontrol select the "Microphone" from the dropdown under the "Input 
Devices" tab

Result:
pavucontrol resets the dB gain to 0%, "the default" without me even touching 
the volume slider...in fact I CAN'T touch the volume slider for the mic.  Why 
can't Pulse work with functionality ALSA clearly provides?

Googling for answers on pulse and volume issues just seems to return a
lot of annoyed users and scripted hack answers which really aren't
solutions.

If I had a way to set the port volume for the mic and have it remain
that way permanently, that would work for me.  After reducing the dB
gain I can still up the volume to compensate without the hiss returning.

If we can determine it is a bug somewhere and fix it at the root, even
better.

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https://bugs.launchpad.net/bugs/1654448

Title:
  XPS 13 9360 and 9350, Realtek ALC3246, Headphone audio hiss

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