You have told us that you have done a lot of door work. You have also told us of the many fights you have experienced. It's not drawing a long bow to suggest you may not have gad a lot of training in this area.when i look at de escalation it generally seems fairly primitive. There seems to be no structure to it.
say we compared it to sales. Which has similar tactics and aims. Their methods can be incredibly comprehensive.
Having trained people in sales, I would agree. There are a number of similarities but I have to disagree with primitive. Body language is important in sales as it is in de-escalation. The same could be said for personal space and distance, tone of voice, volume, body positioning, assertive behaviour, eye contact, confidence, perceived knowledge and your movements. Again, Geoff Thompson has produced volumes on the subject and from what I have seen, it's a big part of his training.