It’s obvious from your video that the crown race doesn’t go all the way onto the seat. Therefore it doesn’t sit flat and it has play. Make sure that it’s not the crown race itself causing the issue. Put it on another fork and see if it fits or try a different crown race on your Chinarello fork. But I imagine that it’s simply an issue of manufacturing tolerances. You’re probably going to have to measure the crown race seat to see if it’s out of round and carefully sand away excess material until it fits. Not exactly for the faint hearted but I think there should be more than enough material there.

Another good example of what can go wrong with frames like these.

I didn't even think about 2x gravel! 

I have a 10-42t cassette and 46-30t chainring. That combo would give great high and low gear range. I could even try slapping on a 9-46t!

46/9 would be an absolutely gianormous gear. That’s the equivalent of a 56/11.  I’m running Ekar and with a 38t chainring and a 9t cog in the back I can comfortably pedal 55k/35mph on descents. More with a high cadence.

my favorite tpu tube is the Cyclami. You get a lot of tubes for $4usd.

Are they better now? I bought the 1st gen Cyclami tubes with non replaceable valve core and they all started leaking air slowly for no apparent reason. I couldn’t find where. So I avoided them ever since. Their repair patches are great though.

I paid 52 USD for shipping to Germany including customs clearance. Which is  considerably cheaper than what I paid with other sellers.

The price is crazy atm. They raised it prior to the 11.11 sale. Like I said, I paid 380EUR not including shipping. If you can get that sort of price, I say it’s a steal for this frame. Obviously I don’t have long term experience, though.

The build was super cheap because I was able to use heaps of parts that I still had lying around from earlier builds. In the age of proprietary parts, all my regular seatposts, bars and stems collect dust. And nobody wants them.
I also bought a number of things used such as the cranks, the cassette and the RD. And obviously the HED wheelset.

Finally, here it is: It's been built already a couple of weeks ago but it took me a while to find mudguards that I like and to fit them in a way so they look neat.

The build process was the easiest I've had so far with a D2C frame from China. My first impression as to how clean this frame is finished (apart from the paintjob maybe) carried through all the way to finalizing the build. No issues whatsoever. Brake setup was easy. No headset play. No problems with the BSA shell. The BB screwed right in.

I got a 1stgen HED Ardennes wheelset for an incredible 85 EUR. Inspecting it closely, I realized that these HED branded hubs are indeed just some regular old Novatecs. And sure enough I could convert the front hub from 15 to 12mm thru axles by using some Novatec end caps.
I also converted the rear hub from a Shimano HG freehub to Sram XD with Novatec parts I had still lying around (I use more or less only Novatec hubs on my wheel builds).

The bike is a beautiful Franken-build that works perfectly together: LTWOO gr9 mechanical levers with Zrace XG calipers, a Zrace (Rotor copy) crankset with an Aliexpress direct mount chainring, a Shimano GRX rear derailleur and a Sram 10-42 cassette.

Tires are Pirelli Cinturato Allroad. They measure around 38mm in width on these rather narrow 20 internal (by today's standards) HED rims.

Mudguards are Curana C-Lite with Ass Savers mudflaps. The set is very light at just shy of 400g. The entire bike as pictured including the rather heavy flat mount pedals, cages, garmin mount etc. weighs 9.1kg. The wheels weigh somewhere around 1750g. It could easily be half a kilo lighter but it's not an important factor for me.

My significant other rode it a couple of times already. It fits her well and she loves it.
My goal was to build a modern allroad randonneur kind of bike that is versatile and capable for someone getting into riding. This frame fits this purpose perfectly. I can absolutely recommend it. In fact if I didn't own a custom steel gravel frame already, I wouldn't hesitate getting another one for myself.

The fact that it still has a round seatpost and a regular bar and stem obviously makes it a lot easier to adjust the fit in the future if needed.
The integrated fender mounts are a cool touch that other frames don't always have (especially not down inbetween the chainstays).

Same company offering their stuff on eBay for even lower prices. I wonder why. I’ve noticed that for carbon frames, too. Lately BXT have sold their frames for crazy low prices on eBay. About 2/3 of what they quote on Aliexpress. Aggressive marketing? I dunno.

Anyway, got a charger, two batteries (400 mAh) and an RD battery cover for 50 quid. Good deal, I think.