This is imperfect, but I've been training to have the same technique as Yuuri the Japanese Singer for around 5-6 months. If you have any harsh critics Im all ears!
For the problem: I really dont know if this is what you call raspy/gritty technique, but its near- It doen't hurt but I feel tension in my jaw and my whole face when doing high notes, other imperfections please go ahead and tell me