the conclusion if you can really call it that is covered in the intro summary and the endpapers:
Crumpp I presume you are referring to these NACA documents:
If so I have them. The RAE report is quoted as a source or reference in these NACA reports. In addition the first one also references the other RAE report "Notes on the dogfight"
All three documents are imo in general agreement. The Devs should study these ! "Combat" flap usage in the classic IL2 imo was totally out of whack with reality ... sadly I am not so sure much has changed in CLOD.