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So like a sort of silicone gasket that expands in the gap between the wedge and the post when compressed?
Gwiiin-
yes that's how this frame's seatposts worked .
the wedge was less at an angle, but it wasn't flat either. So there was silicone expansion and displacement as well.
edit :
Glws
i had another version of that on a BMC slr01 but the rod was pulling a silicone? bung that would expand. the top part of the sytem with the hald turn of allen key was the same as yours so it was definilty another take on it from BMC.
If one would find a piece of the same material, cut it to shape between the carbon and alu wedge, maybe it would help with slippage once compressed.