That link isn't telling you shit This, however, is good http://www.4secondsflat.com/Spark_plug_reading.html
If you're running lean or hot, I'd say your plug temp was wrong for the set up, which means something needs to be changed.
Jetting and mixture settings.
Dirty slides.
Plug gaps.
Plug leads
Valve clearances
Exhaust leaks.
Ignition timing (but it's non adjustable on a GSX, unless you slot the timing pick up holes and I doubt this'll fix the actual issue)
Does the bike pop and fart when you get off the gas at high revs and engine brake?
91/95 does not change you air fuel ratio, what you're seeing is (if it's actually pinking) the 95's ability to resist pinking.
Ninja edit:
Have you synced the carbs? If not, do this first.
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