Did you inspect/test the connector for the #6 coil and #6 injector...?
On each of those connectors, what is the voltage to power, is it exactly the same as the other cyls...? A voltage drop indicates a bad connection somewhere in the circuit...
(hmmm... might be an idea to check all ground connections, regardless of the problem.)
After this, if you did all the tests mentioned in this thread, if the problem is still present, it can be categorized as "hard"...
Do you know anyone who has an automotive lab oscilloscope...?
If you do, get them to look at the injector and coil PCM drive voltage waveform, see if #6 is different...
Also get them to look at the crank sensor waveform to see if it is uniform.
There has to be a reason for #6 misfiring like that, each cause has to be eliminated until you find the one...