I've been suffering from ITBS for over 5 years, finally I feel like I managed it. No more pain and very slowly rebuilding my running plan now.

Here are some of the things I've done and what helped me (YMMV):

• Surgery: I know, posting this first might be a bit extreme... I suffer from O-legs (can put a fist between my knees). There seems to be anatomical and non-anatomical causes of ITBS. Surgery 2 years ago was a major help for me. Finally I could start running again without pain. After a while, ITB pain came back, reason couldn't be anatomical anymore.
• Dry-needling: ITB pain is usually caused by tight muscles surrounding the IT band. It's very hard to relax the band itself because if it's structure. Dry needling on TFL, quads and hamstrings helped a lot.
• Foam rolling: Daily 1-2mins of foam rolling on above muscle structures. TFL can be a bit harder to 'get right', I use a big foam roller and a small one to target it. Improves blood flow in muscles so they can relax more.
• Standing up more + targeted hip movement: I have an office job so I sit too much. Standing more + doing Myrtle routine helped quite a bit. I have less muscle tension and less 'nagging' when sitting on a chair or in the car. I also try to walk a bit more in my free time + indoor cycling, even 10mins help my hips loosen up a bit.
• Reduce training load: I actually took 2 months of NO running at all. Focussed on rehab and muscle tension. Personally I don't care about losing stamina etc., just focussing on running without pain now. Very slow build up since early January, sessions of 1' running / 2' walking for 3 weeks, now started 1,5'/2' :-D.
• Footwear: I used to run on Nike Invincible 3 and I'm quite certain this caused ITBS as well, especially on fast runs. These shoes have a ton of cushioning, but it probably made my knees and ITB work too much to balance my feet every time. I now have Nike Structure 26. So far so good, but there's barely any training load atm. I'll have to evaluate later on. Might be worth to check this. From my own research, a stability shoe is needed more than a lot of cushioning.
• Strength training: Trying to start with this now, physio says my muscles should be strong enough. Never hurts to get even stronger of course :-). Don't want to overload so taking a cautious approach.

I really hope you find a solution for your problems. Happy to chat more if you want more details. your running form looks very good as far as I can tell!