if you have a tube amp, if it is not biased correctly both power amp and preamp, you will get lots of fizz and low clarity, but poorly biased power amps will affect this the most. if it is biased you will want to achieve more power amp saturation and less preamp saturation. Also, don't judge the buzzing and fizz until your guitars are entirely in a full mix with bass drums and other instruments. what you would consider as fizz in your tone will actaully be the high end clarity and sizzle in a mix.
if you are in a mix and you notice that there is too much high or fizz, then you roll the highs (a low pass). 12K is the best place to start and then you move it around until you find your prefered sweet spot.