I know that DANE is not yet really commonly used, but even starting with DANE is a very complicated issue - since tools like the SSL check here do not support it it's very easy to make mistakes and thus shutdown your site in case someone uses it on client side.
So I'd like to have at least the DANE checks also here in SSL test and a grade F (or X :-) or something alike when DANE is wrong. Probably no big positive influence when it is right.
When someone is setting up DANE and does mistakes then SSL-Test will show that and that would be very helpful.
I found this test, which checks DANE, but the rest cannot compare to your stuff: https://ssl-tools.net/webservers
Testing mail ports and STARTTLS and ... would also be VERY helpful :-)