While much more can always be said, following previous post of mine might satisfy OP's curiosity at the moment (I'll also be available much later today - about 14-16 hours, and willing to answer any additional questions and clarification):
A new monograph, Katherine Cross, Heir of the Vikings: History and Identity in Normandy and England, c. 950-c. 1015, Boydell, 2017 (paperback 2021), also argues that the representation of the Viking pasts of their duke and followers in later historical writings in Normandy should be seen as their conscious choice that would serve the contemporary political purpose - autonomous authority within the region as well as the break from the savage Vikings by converting to Christianity - thus its historical accuracy (for the Vikings) is not always guaranteed.