@Latte_tester
AFM Chapter 6, Performance, table defining configurations for various flight phases. Only flaps 45 is listed as a landing config. Only operations according to that table has published performance data of the required format. (Other data is intended for abnormal operations only)
Additionally, the Introduction to the Performance Chapter states;
The airspeeds and airplane configurations for take-off, climb and landing, as presented in this chapter, must be adhered to during the appropriate phase of flight.
Sorry, anything except flaps 45 for landing is NOT covered by the AFM, is prohibited by that wording and, perhaps most importantly, is not covered by flight testing for certification. That "must" in that quoted sentence is definitive. And it's an "approved" page as well.