I emailed this question to Yeti service and got message from Matt Fisher:
The max torque on the seat post QR or bolt should be 6nm. But you can stop once the post does not slip if that high torque is not necessary. If you get to 6nm torque and the post still slips then there is something else happening that needs to be worked out.
I run a Thomson seatpost clamp on mine, just set to their recommended 2.8nm and you're good to go. It's been faultless on a few bikes over the past couple of years and it looks factory which is the main thing!
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