The positive numbers means it's adding fuel, the computer is correcting for the problem because you have fuel trims enabled.
To tune the VE or MAF curve you have to do them one at a time for best results, that link I provided does show/explain how and what you'd have to do. You can't just take what the fuel trim number is and add/subtract it from the VE table, it would end of making it worse. With a wideband (which you need) you can create a AFR error when you tune both the VE and MAF curve, it will collect data that you can apply to the tables to correct the error thus bringing fuel trims in closer to zero. There is a way to make a STFT + LTFT graph to correct the trims but I have never done it that way.
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