I've always had issues with volume levels on Windows, so I stick with Equalizer APO for my solution now. Just set a preamp on the device in question and set it to a negative number that sounds and feels right, plus there's a handy on/off for every setting you choose. Other people might have better options, but I'm lazy AF, and it works for me.
Biggest thing I love that program for is setting a lowpass filter for my Bose, so that knocks in videos don't sound like someone is knocking at my door, then just switch it back off when listening to or working with music. Great tool.
Edit: you can have individual settings per device this way as well.
The same thing happened with Hillary, and that may be due to her husband's presidency, though there may be something to it being gender related - albeit we can't say that's the case due to the incredibly small sample size. It could have simply been her choice, noting that a lot of her merch went with ,la.
Good question though.