The injury puzzle

I stumbled on a link to a Competitor Group article that I actually liked (I know! And usually I'm rolling my eyes with a "Thanks, Captain Obvious, I'll be sure not to eat chili peppers cooked in Metamucil the morning of my marathon."). Of course, it helps that the author is the respected Matt Fitzgerald. I really liked his advice.
He outlines four steps that helped him overcome his chronic knee injury. I could identify with a lot of his experiences, and a lot of the solutions, too.
1. Targeted stretching: This should be obvious for me: I keep having bone injuries related to serious tightness in the hamstrings and adductors. I need to focus on stretching these muscles daily to counteract whatever it is about my running that tightens them up. I've been doing yoga, dynamic and static stretches, and rolling.

Tools of the trade...

I've been doing some of the Iron Strength workouts

2. Corrective strength training: I have weak hips, so my adductors do all the work. Then they tighten up after being overworked. Then I make them work hard again - and the tight muscle tugs the bone, leading to injury. Strengthening my hips and glutes will relieve the adductors of some of the work.
3. Gait retraining. Agh. I haven't attempted this. I do heel strike, but I don't straighten my leg when I do (my knee's bent and my leg is nearly under my body). I guess I should consider better form at some point, but it's a big undertaking.
4. High-tech nutrition. For me, this is loads of calcium, magnesium, and vitamin D. But it also means remembering to take my levothyroxine every day, and adding in calcitonin periodically to rebuild bone. Neither levothyroxine or calcitonin are supplements, but they are natural products!

Have you had to employ any of these steps? Have you considered them as injury prevention rather than treatment? I've been really trying to think about my running in terms of prevention - being proactive, not reactive!