Is there a third-party Finder app that remembers custom column widths in List View?
On the latest version of Sierra, in list view in a Finder window, holding the option key while double-clicking the divider between the “Name” column and its adjacent column. then releasing the option key and closing then reopening Finder to that same folder… the width of your name column retains its new set value in list view.  This only works on a per folder basis You can set custom widths for your name columns in list view for any folder of your choosing.

Here's the kicker though!!  I believe if you resize the finder window itself, this will reset your custom column widths.