A wet plug means fuel is getting there and never burning. No matter the injector spray pattern, with a proper spark and compression, the mixture will fire - and thus no wet plug. So, you have either no compression - which you appear to have - or no spark. With the plug insulator surface carbonized, there is a lower resistance to ground for the high voltage than the spark plug tip, and it is OUTSIDE the combustion chamber. Possibilities are a cracked insulator, broken plug center conductor, a broken plugwire termination, or insulator contamination. Once carbon tracks have formed, you will not be able to clean the plug satisfactorily. Replace that plug, clean the plugwire end, and see what happens.

I have had injector, plug, AND plugwire failures over the years in our M102, and no matter what injector issues you may have, a wet plug is an ignition issue.

Steve

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'91 MB 190E 2.3
'08 RAV4 Ltd 3.5
'83 Lazy Daze m'home 5.7