Implementing PET thinking (designing for Persuation, Emotion, Trust) into agency process

So I have been given the task of implementing in the PET design techniques into our agency's UX process and making sure this is instinctively baked into every project we do going forward.

Currently we use PET techniques but our whole approach is very ad hoc and it's hit or miss whether this occurs in a project or not.

So my question is this: What's the best way to implement this into the lifecycle of a project to make sure the whole team understands the rational behind our designs? How are you guys currently tackling this and how do I make this stick with a studio of around 70 people?

Advice and ideas would be a great starting point for me. Thanks for any input!