Very nice looking car in your photos. And yes, hope you and your family are in a safe place from the violence in Ukraine. We in the US have been paying close attention to the war there and are inspired by your country's efforts.
After watching the video, it's hard to tell exactly what the engine is doing but I think I can see and hear the uneven operation you are describing. It sounds to me like the injection pump timing may be set incorrectly.
What was the timing value (mm) that you set the injection pump to?
And, did you remember to disconnect the cold start device cable when setting the timing? Easy to forget this, and if you do, it results in retarded injection timing that leads to issues like what you are seeing.
It sounds like it starts right away so I agree you can probably rule out air in the fuel. Looks like you did very nice and clean work and I am sure it will run great once you find the issue.
