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So, you swapped coils and the cylinder 3 misfire returned?
Do you have a way of performing a compression test?
I know you said that the spark plug looks fine, but I would replace it anyway since I have seen on more than one occasion good looking plugs, even brand new out of the box cause misfires. If you have used multiple coils and keep getting a cyl 3 misfire, then the coil is not the problem. I doubt the injector is either. It could be rings, valves, valve springs, etc. First replace that plug just to make sure it's not that simple. Then do a compression test.
Please let me know what you come up with. I'll be around. thanks
How did it turn out?