Another film capacitor to try is the PPS (Polyphenylene Sulfide), which was the replacement film cap for polycarbonate 20 years ago. Some say they have excellent sound quality. The one rated in the Humble Homemade HiFi review, an Evox-Rifa SMR 63VDC, only scored a 6. Hard to get and expensive. No personal experience.
Kemet data sheet
DigiKey
Kemet data sheet
DigiKey
Hardware: RPi Zero W | Allo Kali | ProtoDAC TDA1387 X8 | PGA2311 | Icepower 500ASP | Harbeth SHL5
Software: Moode 8.3.3
Source: Win 10 NAS
Software: Moode 8.3.3
Source: Win 10 NAS