I had this issue a few years ago. The kind reply I was given is:
In Track View go to:
Options > Meter Options > Record Meter Options
Options > Meter Options > Playback Meter Options
Options > Meter Options > Bus Meter Options
OR
In Console View go to:
Options > Meters > Record Meter Options
Options > Meters > Playback Meter Options
Options > Meters > Bus Meter Options
Options > Meters > Mains Meter Options
[Edit] Then save the project.
This action sets them as default and should stay without locking any screensets. Even so I think X3 had an issue once where they wouldn't stay put.
They have to be set individually so it can be tedious. There is a feature request
HERE to consolidate them into one window so they can be all set at once. Cast your vote today!