@allo.com Johan I’ll test native DSD256 (iFi iDAC2) for you 
I was having problems with the RPi3 (pops and crackles) with all OS’s (DietPi, RoPieee, Moode).
I tried an Odroid C2 with the same setup and DietPi and all problems disappeared, so I figured it was the shared bus issue (in my setup).
See this thread will all of my observations the last 2 weeks: