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Pretty sure they're the right ones. Good idea I'll remove the pins and try putting the screws all the way in first.They should not be sticking out that far. I suggest threading them in all the way when they don't have a hinge pin in place first. This will make sure the holes are threaded first. The resistance you are probably feeling ATM is probably just the screw cutting threads into the plastic.
The only other thought I have is that somehow you are using the wrong grub screws?