Bike noise, creak, click, creaks, clicks, clicking, pinging sound - help

I have 2 suggestions:

i) Take out your seatpost, and run a file or equivalent around the lip of the non-saddle end. I had some kind of invisible burr on an alu seatpost that caused exactly the kind of creak you mention, on an alu Condor frame coincidentally. I had tried a similarly exhaustive list of fixes before that.

ii) Use an angle grinder to cut your ears off.

Love option 2. I was thinking about trying to sell the bike to Ed. Or attaching some speakers to the bike and playing loud, abrasive music while riding. Or confine my journeys to the OKR. The upshot of all this is that the bike rides exceptionally smoothly, due to the exhaustive maintenance I have carried out so far.

My most recent bit of investigation led me to shine a light down the seat tube to see if I could see anything peculiar.

As it's the lavoro with the cutaway aero downtube, I was thinking that it might be the same issue that Leader frames have, due to the 27.2 shim coming loose and creaking in the frame.

I don't think it is though, because in the case of the condor the tube is actually welded/melded into the the visible part of the top tube, rather than just tacked on to the inside.

I measured the length of the 27.2 section of tube and found that it did match up almost exactly with the length of post inserted into the frame, so it might be caused by some kind of flex between the post and the interior of the frame. Interestingly I couldn't make it click (not conclusive by any means) when I inserted a post as far in as I dared, and I haven't been able to make it click in it's current setup (with shitloads of grease in the seatpost).

I doubt the problem is fixed though. i might try the file idea next. It's become a daily ritual to disassemble part of the bike and fiddle with it.