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@BringMeMyFix
I've had this on a steel frame where the slot that's cut into the top of the seat-tube wasn't deep enough. You could get the hacksaw out and lengthen the slot by 5 or 10mm, which would help the tube compress against your seatpost enough; if that's the issue.
And as usual, make sure the bolt is greased - threads, and under the bolt head.