Find yourself a good physio. Took me years to recover from a severe tear (gave up for years). Every person to touch them say they are the tighest they have worked on. Anybody can touch my ITB's and feel how lumpy they are. Taking up weights/heavy lifting I have doubled my strength but still get issues, I go at least once a month to physio/massage to stay on top of things.
Best stretches Ive been given were the ones that don't feel like they are pulling on the muscle group directly like; lying on back, one knee pulled into chest, toes pulled towards, whilst other leg is in air, toes pointed.
When doing this I can feel it in my hips, ITB's, down side of my knees. I usually hold it for 10s. Swap over.
You're stretching different muscles of the two legs at same time. It should resemble riding a bike. Extended leg pointed, retracted pulled.
Then I switch to both legs pointing at around 45degrees,toes pointed, then pulling knees into chest, toes pulled towards you.
They actually resemble some 'core' exercises, but they work for me and until I was shown them, stretching never seemed to work. Theory being, if you can feel the muscle pulling, that's exactly what it is doing, pulling against you, not relaxing and stretching out.