At Qualys SLL Test labs tests I never had 100% for Key Exchange. Even adding a 4096 Diffie Hellman key did not do the trick.
Now I found adding
SSLOpenSSLConfCmd ECDHParameters secp384r1
to the config from Part 4 does the trick!
Now I can have all your bars on Qualys SSL Test at 100% without having an insane config no client can connect to.