I'm totally convinced that the best way to deal with all of this AC noise/distortion issue is to totally eliminate the WALL AC.....Period! The market is now aflush with extreme, high quality, lithium battery powered portable power generators.....$1000 get you near top of the line. One or two of these, a few solar panels outside and you are done. Or, charge it with an AC charger when you are not listening and disconnect it when listening.
If you are into the whole alternate energy thing, A few DIY Lithium cells a BMS and a well regulated, quality 12-48VDC to 120VAC inverter and you are in High Cotton!
Or how about a TESLA Power Wall.....Disconnect the whole freak'n house from the grid.....but be aware all the internal noise generating devices are still connected...Dimmers, Wall Warts, Compact Fluorescents..
This is the direction I'm headed....DIY cells, BMS, Inverter!