I definitely don't like QFD (I cannot even find it has been heavily used in history)... The reaons is that understanding the origins of flavour is one of the big puzzle of our time and we don't have any solution yet, although plenty of proposals for an underlying theory. By reading it like this, it sounds like being a solved problem, which is not. I hope you understand my concerns (this one I will not let it pass).

Also, QED and QCD are special in the sense these are unbroken symmetries. The symmetries are exact. The story is different for the weak interactions.

On different topic, you may like this illustration. Data shows that at small energies, the strong coupling is stronger and stronger (confinement) and at large energies, it is weaker and weaker (asymptotic freedom). :)