Your compression is fine! Not sure if the miss is coming from this plug, but I wonder if the intake gasket isn't leaking/pulling some oil in on that cylinder.....
I have been fighting intake sealing issues. Last time I pulled the intake all runners were dry on the heads and intake so I bought a set of Cometic aria I'd fiber gaskets close to the same thickness as the last set ( which were Felpro steel core ). I didn't replace the plugs though. Maybe I will pick up a new set of spark plugs and try again.