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I have the same problem with my (identical) CAAD12, though I'm not convinced it's the bung. I frequently find there is a slight sticky-sounding creak at the handlebars. It used to go away when I tightened it all up but it came back routinely. Now I'm finding I'm tightening at the top cap as much as it'll reasonably go but it won't go away. I had the mechanic at Swift Cycles have a look at it and he put a more substantial bung in but the problem has come back. Currently weighing up whether to send the bike back to Cannondale for them to look at as I'm advised that this is the next step. Ballache! I read online somewhere of another guy with a similar problem with his CAAD12. Hmm.
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I had this issue with my CAAD12. I use to have to tighten it all the time. However after removing the spacers above my stem, so the top cap sits directly on the stem it has been solid! Cannondale say you should not have any spacers between the top cap and stem, not really sure of the physics behind it, but willing to accept!
The headset expander bung on my 2018 CAAD12 loosens after every single ride. What can I replace it with that will actually work? What about the Deda bung for carbon steerers? Ive used it before and it’s been great.