We need to strike a balance when it comes to using our signature strengths! If you look at some of your darn it's (willpower failures) an over use or under use of a signature strength may be at the root of the problem. Discovering how to strike an "optimal use" balance can be part of your implementation intentions that will help make more progress towards your goals.
You can check out the definitions of overuse, underuse and optimal use of each strength in the VIA here.