What's the nature of the corruption? For example is there too little data?
How do you mean "flush of the write buffer"?
3 seconds sounds way too short to actually write the data.
I presume you're unmounting the device before ejecting it?
Note cp is just doing read/write so unlikely to be the issue.
Note also cp reads/writes 128KiB at a time,
whereas dd defaults to only 512B at a time and so may avoid async issues.

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https://bugs.launchpad.net/bugs/1681138

Title:
  silent file corruption with cp -ar file transfers to USB

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