Scientific support for the Strong Anthropic Principle.
There is no scientific support for that theory. The principle itself is not at all scientific. It's a false premise that was philosophically destroyed a long time ago. Of course this universe has to be perfect to support life. Otherwise you wouldn't be here on the internet. To say "well if it was off this much we wouldn't be here, that's so amazing it's proof" is just nonsense - sorry.
Claims of incredibility have no scientific basis and are just personal opinion.
The theory is basically a claim of incredibility. No real science there.