Since this sideways slip started and the last post I've been focusing more on ignoring this sideways slip, I've also moved my cleats back about 3mm on the pedals, from "5.5" to "5" on my Giro shoes that seemed to give a bit more comfort.
I removed those makeshift shims, tried some proper ones and they made no impact on my stavility, the custom carbon soles didn't have any impact either so removed them and went back to how the shoes were before.
I've also been looking at stretches especially the IT Band, using some of these exercises on here
https://www.bikeradar.com/advice/fit...-need-to-know/
What I noticed is my left IT Band is incredibly tight compared to my right, the same exercise I can get my right knee about 5cm closer to my face than the left.
Could this be the culprit all along would it have such impact on stability ?
Oh the flip my my left hamstring is able to stretch slightly more than my right hamstring.
My hamstring and IT bands are both evidently very tight.