Try out this distraction variation to help you get some extra range out of your pigeon stretch. 2-3mins per side. Let me know how it goes. 

A lot of athletes with tight hip capsules have difficulty getting into position to maximise the soft tissue release from stretches like the pigeon stretch. Using distraction techniques can really help get access to the areas usually inaccessible by simple passive stretching. 

Patrick Fitzsimons Crossfit games athlete of the future and inspiration for the super pigeon swears by it and if it works for his massive hips it will work for yours too.