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@M_V
DMR or Gusset or someone do a seatclamp which clamps to the frame and also to the post, it's like a bmx double bolt clamp but the top half is the right size to clamp the post not the frame, it's meant to stop post's slipping or twisting if you land on the seat from a jump, if it comes in the right size it might help? Or just use a 2nd smaller seatclamp on the post to stop it slipping down. Won't help if your seat twists though.