My views differ, I believe that you should follow your dream and job. Your S always comes first though and needs to see his mom sometimes even if you want to be free. Yes, I still see your W as a WW too, I think your assessment is correct.
Apply for custody and move, if the courts deem that's the best choice it is.
Where I do agree with Zues etc is that, it doesn't serve your interests best nor that of your S to have two hostile parents. This is something that needs work for all of your sakes. In particular for you.
I read a brave and wonderful dad, a caring one who has struggled to protect his son as much as he can. Who resolved issues with his own father, who built a new life.
It's time HP to detach and work towards your best dreams.
V
Freedom is just another word for nothing left to loose. V 64, WAW