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They're there for a reason...if you don't develop any problems, congrats...if you're not seeing an actual benefit (in the form of increased MPG), then I suggest sticking to what the manufacturer originally put in there.
Potential reasons not to...
RFI.
More current = over heated coil.
More current = melted spark plug electrode.
Potentially messing with spark timing, leading to better or worse gas mileage and/or higher emissions.
Despite all that, I'll be interested in seeing your results. My attempts, in my youth, at using high end plugs and "racing" plug wires resulted in worse gas mileage.
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