Hi Razvanvrs,
I also have a similar experience with DCS Puccini power supply. I am using a DIY cable at the moment. LessLoss Signature also didn't work good with Puccini and U-Clock. But my Puccini sounds the best when L reverses with N on power input. Not as specified by the manufacturer. Did you try to swap N and L contacts inverting the schuko plug?
I also have a similar experience with DCS Puccini power supply. I am using a DIY cable at the moment. LessLoss Signature also didn't work good with Puccini and U-Clock. But my Puccini sounds the best when L reverses with N on power input. Not as specified by the manufacturer. Did you try to swap N and L contacts inverting the schuko plug?