Personally, I don’t use the safety warning. I run 2 programs for a loop each, making sure repeat is off (I use VLC player on my PC). I also keep my phone on and run Frequensee so I know it’s running (I use ultrasonic).
It sounds like the safety warning is made with the solace mask, which is MUCH quieter than the old masked tracks. I remember running solace masked in QV2 one time, bumping up the volume since yes, ite’s very quiet. Saint warned us not to run it too loud.
I don’t think you’re running subliminals at too low a volume. Run it like you’ve normally run it so you don’t give yourself earaches. And look for changes in thinking to verify you’re hearing it. That’s how I’d check that.