Your base is better for RÖSLE, Allgäu-Brennerei, Wieskirche and Forggensee.
Compared with using Schloss Neuschwanstein as the routing center, Roßhaupten pulls you north/east. The Ostallgäu shopping day becomes very efficient; Sonthofen/Oberallgäu still works but is more of a longer excursion. Breitachklamm is now just over the expanded radius at ~62 min, so I’d treat it as “borderline acceptable” if you really want the famous gorge.