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Looking at those plugs, man those are clean. Too clean. Are all of your plugs like that? I can't tell you where your fuel is going, but it sure isn't going through the engine.
With an "iffy" O2 sensor, we burned rich. Changed it out for the heck of it, and we definitely got a better running engine, though minimal gains in fuel economy. The one plug we found that looked like yours was due to a faulty injector. Caused it to run rich on the other three, but we could smell the rich fuel.
In your case, I'd look for boost or vacuum leaks as said above. Maybe leaking out the BOV? Something else we did was to get an adjustable FPR and pressure gauge. I played with that, and different pressures made a lot of difference in how it ran with the stock injectors, 255 pump, and T28 turbo.
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