Are you following Cannondale's instructions by having the preload cap rest directly on top of the stem, i.e. no spacers above the stem?
RE ovalisation, it's possible the head tube was out of spec from the factory, in which case warranty claim time.
I have a 5mm spacer above the stem. Really surprised this could make such a difference.
Yeahbut follow the instructions - if it still doesn’t work at least you know you’ve done everything to spec.
@wjrh started
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Are you following Cannondale's instructions by having the preload cap rest directly on top of the stem, i.e. no spacers above the stem?
RE ovalisation, it's possible the head tube was out of spec from the factory, in which case warranty claim time.