I've actually found the same thing with my cheaper cannondale carbon post. have to tighten it way over recommended to get it to stay put.
Having ridden both a fair bit now I'm not convinced the 12 is much of an improvement over the 10. the fork flexes a lot in comparison, both under braking and heavy cornering.
Is your frame big or do you have a lot of spacers? Surely it's more likely that your wheels are flexing? I race my 54cm CAAD 12 and would probably stop doing so if I could detect the front fork flexing!
I've actually found the same thing with my cheaper cannondale carbon post. have to tighten it way over recommended to get it to stay put.
Having ridden both a fair bit now I'm not convinced the 12 is much of an improvement over the 10. the fork flexes a lot in comparison, both under braking and heavy cornering.