1. The stains are real blood.
You have not shown convincing evidence of this.
2. They could not have been PAINTED on the Shroud.
Why not?
3. They had to be “imprinted” on from a real, dead human.
Only if the human was of impossible proportions.
4. This human was crucified.
Not necessarily or even likely. Even if a human was crucified this doesn't favour any particular date; people crucify themselves in acts of devotion right up to the present day.
5. A 14th century artisan able to produce this image would have to be an absolute genius.
No, just a moderately talented painter.
6. He would be able to produce an artifact that even 21st century scientists cannot.
This is illogical. You cannot know what the shroud looked when it was first produced, so you cannot claim that such a thing cannot be replicated. The 600 years of ageing (or 2000 years in your view) means that anything produced now would not resemble the shroud until it had been subjected to the same storage, the same events such as fires, and the 600 years of time.
7. The wounds fit perfectly with those of the Biblical Jesus and modern medicine.
The maker could read the Bible, and had a living body (or a cadaver) to practice on.
8. They do not all agree with tradition.
This directly contradicts the above. The wounds cannot both agree "perfectly" with the Biblical account, and at the same time, not agree.
9. This artisan genius would also have to be sociopathic.
Why? You have not shown that it is necessary for the maker himself to murder someone. Even if you could show that there is blood on the shroud, blood is freely available in 8 pint quantities in every living human, and it even replaces itself in a few hours as long as you only take a pint or so at a time. Cadavers would be easily obtainable.
10. He would also have to be rich.
You have no evidence whatsoever to support this.
11. He should also be famous, and have produced other images of the same genre.
Again, you have absolutely no evidence to support this.
12. He probably wasn’t Leonardo.
Irrelevant. Leonardo was not the only artist of that time period, just one of the more famous ones. In passing, are you conceding here that the image on the cloth resembles the conception of Jesus in 14th/15th century European art, and is unlikely to resemble a first century man from Palestine?
- Therefore: it is EXTREMELY improbable that the Shroud is a fake from the 14th century.
Nothing in your twelve points is even close to being a support for your conclusion. Nothing in your points addresses the carbon-dating results in any way.
To help you, in order to cast doubt on the carbon-dating results, your argument needs to go something along the lines of: "the carbon-dating results of all three labs are wrong because <specific problem with the collection or processing of the samples, or with the science of carbon dating>. The evidence supporting this is <evidence goes here>."
Getting sidetracked into irrelevancies which are not time-dependent, like the presence or absence of blood, is not going to help you.