The best advice I can give if you are picking up King is to get out of the mindset that he is a grappler character. Making his throws high or low completely destroys the typical grappler archtype’s hit/throw mixups, not to mention having such slow startup and being throwable means the opponent can do literally anything to evade your command grabs. Mash jabs > King.
Sure you can condition your opponent to stand or crouch, but why then go for a command grab when you can safely hit-confirm into a big combo off a low/overhead?? The only way throws start to become useful I find is if you’ve conditioned your opponent to be afraid of your rolling elbow mixup and they’re waiting to block high or low, then and only then go for a grab. Without this fear people will just jab/throw/stare you out of your grabs, assuming you guessed right with the high/low also.