It sounds good to me quentin but I'm just listening as a listener listening to someone sing a song...not as a teacher critiquing technique. As a listener it sounds good. I have no insight on your questions...sorry. But I am interested in hearing responses from those in the know. I add grit to my singing often but normally it is a much lower range. For me it's more "rasp." On occasion I do use it for higher notes like falsetto. However no matter how I use it I would never be able to explain it. That is what makes me interested in reading responses. For me it is just "imitation of sound." Like I was a child playing and making believe i was a monster or an animal or something. I just make sounds and apply them to pitches and melody. But there are some songs where I do falsetto type of grit or rasp where I somehow use my nasal passages to do it. It's very nasal somehow. I couldn't explain it. I use it in a Ray Charles song I do (on my youtube channel) called "Drown In My Own Tears" as well as some Joe Cocker songs...Feeling All Right" for example, among others.

Yea, I hear ya. If there's an actual technique for it, I have no idea. I just do it. Like mimicking a sound. On the lower tones it's easy but on the higher ones I can't do it on everything.