Just like to thank you for a way earlier advice on catching the footstrike with our thighs and glutes. I think this truly helped me to keep my foot landing below my centre of gravity and to activate my gluteus medius to stabilise my hips instead of straining my back, hamstrings and ITB. My core is also now better engaged than before.
It took me a while to catch on how to execute this positioning of the hips and trunk, but it sure was worth it. Especially curve running, where I can lean more towards the curve with the glute med taking the load and no longer the ITB and lower back and piriformis. I've had to slow down my fast reps a bit to get it right, but it was way better to catch the correct form than to continue bashing out great times with poor mechanics.
Once more, thanks for the advice and keep the passion alive!