Norbert Vettel says that competing at the back of the field this season with Aston Martin “accelerated” his son’s thoughts of retiring from F1. Sebastian Vettel transferred to Aston Martin in 2021 after leaving Ferrari, motivated by the Silverstone’s based outfit’s challenge of becoming a front-running team in F1. The four-time world champion brought his talent and expertise to Aston Martin, hoping to help his new squad improve over time its position in the pecking order. In his first season with Aston, Vettel scored seven top-ten finishes, enjoying his best result at the Azerbaijan Grand Prix where he finished second…