I learned to draw Iso about 20 years ago. I learned it in stages (steps), but was slow, because I was mentally "stopping" at each stage, i.e. consciously thinking about where the weak hand went before the grip, punching out, proper sight picture, good trigger break, etc.
I didn't get fast until the only thing on my mind was to engage the target when the buzzer went off. Once the memory was ingrained in the muscles, I was many times faster just "zoning" the draw.
There was never any video of my draw (that I'm aware of), so as far as I know I may have looked "correct" or just plain goofy doing it, but my rounds were getting on target fast; that was the goal.
No points off for incorrect weak hand placement!