SOLVED.
Root cause DME failure Cylinder 5 circuit. I replaced IGBT in my DME, but that did not help, I believe it was a pre-gate driver chip ATIC71:
https://www.u-obd.com/product/atic71b1/
But that was a bitch to get - only from China! Think these MSV80 Siemens VDO were made in China?
What a bitch to solve.
so.. I obtained a MSV80 ECU from junkyard, and got it cloned..
MISFIRE GONE FINALLY!!