I would def try another crank sensor if that's where your problems started from....
Even borrow one of another perfectly running car if you can?

Also what about pulling one lead off at a time and connecting it to a spark plug then revving the engine stationary and seeing if the spark disappears after 5k revs, trying each lead in turn?
If it does at least that may tell you what cyl the misfire is on if it's ignition/spark related

Cheers Paul