high end is like sugar, once you get a taste of it, any more sounds great and anything less sounds crap, problem is it's hard to tell when you've gone too far, have to start dark and keep it dark, once you bump the high end (pun intended) you need to keep bumping and bumping. vocals snare and kick beater are the only thing that need to cut through, everything else is accessory. electric guitar is midrange instrument, if you keep it dark in the mix, everything above it is made brighter by relation without needing to brighten them extra. listen to SOAD Toxicity guitars, dark af, but clear as day, it's all midrange, high end is for vocals and snare (and hats if the drummer is an artist)