Thanks dear Mike_LC. Could be wrong, but making my way to the devices’ Audio settings list is something I believed had been achieved (see previous screenshot). It’s the volume limiter altogether that’s not showing among the settings.
Could be an active option forbiding the use the volume limiter, but that’s just a guess.
There’s a bunch of advanced settings too, among which I see “force max volume at playback start”. Decided it should be off for every device, even though the crazy “progressively increasing to maximum volume problem” may not originate from there as it’s a randomly occuring thing (or could it?).