Maybe this sort of thing would help. It says for a Sony TV (2018 vintage), that’s there’s a way to adjust the audio out volume and also play around with Audio Normalization settings (sound leveling): How to adjust sound settings on your Sony TV - Sony Bravia Android TV Settings Guide: What to Enable, Disable and Tweak | Tom’s Guide (tomsguide.com)
So maybe your TV(s) have similar settings? Interesting that Abram inquired a while back about how to deal with TV volume problems: How to normalize TV volume? (reduce loud ads, etc) - Question and Answer - Hearing Aid Forum - Active Hearing Loss Community (hearingtracker.com)