Ah, it really did sound like you got one of the defective hinges. Though, you still do have the option of buying the 4.0 kg hinge kit for $24 and installing it.

Ah, it really did sound like you got one of the defective hinges. Though, you still do have the option of buying the 4.0 kg hinge kit for $24 and installing it. Having to buy a part isn't ideal, at least it's available.