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What are you using to turn the chaser? It's going to be tough, you're going to go so far, push it a little, then back it out to clean it. Repeat until it's clear. Use PB Blaster or at least WD40. If the chaser still won't work, just get a tap that's the right size as it would cut new threads in a smooth wall, so it's going to work to clean them (though you HAVE to make sure it's going in with the threading).
Leak by an O2 sensor is bad for the reading, in this case it's probably reading leaner than it should because of the leak and calling for enrichment which is causing the fuel in your oil.
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