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I wouldn't be too form obsessed as it's probably an imbalance causing the form issues rather than the other way around and your form will fall apart as soon as you get tired anyway. Get everything strong and firing properly and your form will improve unless you have a comically extreme running form. I've been through this a few years ago months of rehab and hundreds of pounds spent but better than ever now. I'll give the long version if your interested ? Needs confirmation by a physio first but sounds exactly the same as my issues
"Broken record" post warning.
Been gradually upping the distance again, and it's been going okay. Last few runs the itb tightness has starting coming back, bordering on pain. I've started trying to be more conscious of my form and becoming aware I'm slightly tilted forward and so likely underusing my glutes. Back to stretching and conditioning. Grumble grumble.