You have an excellent system where you have given attention to detail. As already mentioned by other members I see two weak links as follows:
1: Power conditioning. This was one of the largest improvements realized with my own system. I recommend top of the line models from Shunyata or Audience. I would do this first.
2: DAC/Streamer: Your AR CDP is phenomenal. However, a good DAC/Streamer will reduce noise inherent in CD playback and will have more modern DAC design for higher resolution formats and SDS. There have been many improvements in SQ and PRAT over the past few years. While I have personally not had budget to improve my DAC/Streamer to date it is planned. I auditioned a few. My favorites in order are Mola Mola Tambaqui, DCS Bartok, and Bricasti M1 Series 2. I recommend Aurender or Lumen as a music server even though the mentioned DACs stream.