Is this what your coach is telling you. Get all the advice you can. That pic is of Mitchell Johnson who was express. You dont wanna be that do you then you are asking for trouble with stress injuries.
That was just the first image I found on google that showed what I meant.
I probably take most of my technical stuff from Cummins and Starc (even though he’s left handed). They both have really nice, rhythmical bowling actions.