I’d say it all looks kosher to me. Good mornings can be done with all kinds of bar & foot position, as well as ROM, tempo, rep range.
The 3 best golden rules I believe in is you need to absolutely get tight & stay tight in the core through the entire rep, never go to a true 1RM because the risk/benefit ratio is poor, and the knees should stay unlocked. When I first taught myself to do them after seeing them online I tore my hamstring fairly seriously by doing them with totally locked knees. There’s no need for that, and it would have prevented a month layoff and a nagging issue that has retorn several times over the years.
Also, maxing out on them I damaged a vertebrae in my thoracic spine years ago. And for what? Nobody cares what you good morning. Pushing them up is a means to an end, remember that. The numbers are for your reference only. A rep max is as useful or more than knowing 1RM.
When using a straight bar, I prefer them low bar. Less chance of losing control of the bar, better leverage to lift more weight, but also feels safer on the low back. One of the rare times where I think it’s safer using more load vs a harder setup.