Hello,
in the meantime i got it working. The problem was the master CA setup: after instantating the ca the certs have been replaced by the certs from another instance - but the entires clone*.privkey.id had not been updated.
After recognizing this I only had to match the (unsigned) output of certutil -K with the (signed) params in CS.cfg. I did this by inserting some "System.out.println" into com.netscape.cmsutil.crypto.CryptoUtil findPrivateKeyFromID() and patching the new .class-File into the .jar-file. Watching the catalina.out while trying to clone the ca gave then all needed infos.
Another fresh install after that completed without problems.
Yours,
Alexander Jung