I listen on multiple systems in multiple places also. I also compare my mixes to Professional or good sounding mixes of similar styles or at least similar genres.
I was looking at Acoustic Ceiling tiles at Home Depot the other day. The kind that fit in a T-Bar drop ceiling. They are 23 1/2 inch X 47 1/2 inch. About the size of a movie poster on the wall at a movie theatre. They say "55%" sound reduction. I put them in a tent shape and stuck my head inside and it felt like my brain got sucked out through my ears. Drastic difference in a noisy and echo-ie environment. $20 for 3 sheets. $35 for 6 sheets.
I think these would make a big difference if I hung a few spaced out on my ceiling and walls with a 1/2" to 1" air gap behind them. They are very light weight and easy to cut. So, I might make some 24 X 24 to fit some areas. Might even try fitting them into poster frames from the 99 cents only store or a thrift store to give them a clean edge look.
But, for now I gotta work on my Christmas party songs. Maybe in January. Just an idea.

Does the noise in your head bother me ?