So, two modifcations to be done:

• The Mkps and the ELKOs are removed and replaced by a ERO MKP1845 with 3.3µF.
• The 470µF ELKOs for the supply voltage are replaced by Vishay MKP1837 0.1µF caps.

So, what does it gain? Well not so much as expected. The beast has been smoothed now, even higher volumes can be reached now without hurting.

But, still some fundament is missing in sound. So the next step is to try another voltage supply,