Interesting, they have great clarity, but i didn't fnd it particular bright. Perhaps because i was running it through a Vader 4x12, with guitars in both Drop B and Drop C.
To the OP - Keep having a play around with it all dude! Keep trying new things, try doing things like mixing up the low end, and then the high end. For instance, roll of the bass and crank up the girth, then roll the girth off and crank the bass. Get a feel for how the difference EQ adjustments work. Obviously try the same with the grind/treble/prescence. We all have different gear and different musical opinions regarding what tone we like, but i'd try rolling the gain off a fair bit and maybe turn up the prescence a little more. Try lots of things, it's a brilliant amp and can do many things! Enjoy!