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@auftakt
Thanks for the comments fellas.
For the record, the "bad" clamp is marked as 34mm, I have a Thomson to try in 34.9mm. Seat tube OD is 32.5mm.
@PhilDAS, Frame is a custom jobby from a local (well respected) builder. Tubeset is Spirit HSS, so the OD of the seat tube is non-standard (at 32.5mm). Seatpost measures correctly with my calipers: 27.18mm, spec'd ID of the seat tube is 27.2, seems correct with the calipers as well.
@jammy, I was worried the clamp is a bad one actually as it seems to sit askew on the seat tube before I apply torque, which I guess could create an uneven force allowing it to slip upwards. I just received a Thomson clamp (inspired by Reilly's HSS frames) and I'm going to give it a try after work.
Hopefully the builder will fix up the paint under warranty. Right now I am definitely not comfortable with the ragged paint edge below the collar, and the exposed steel. Absolute bummer since the build is brand spanking new.
I appreciate the input!