Jumping accuracy

Watch a World Cup DH race and you will see many jumps taken well. With a pro they have a very good idea of how far they will fly before landing. If that is appropriate to land the backside of the transition, then they don’t have to do much. If they think they’ll come up short then they put some extra energy into their downward “stomp” prior to take off to gain some extra height - and with it extra distance. When the race speed is in excess of the jump’s ideal speed they have to “scrub” the jump to land the backside (and not fly past to flat, which is both painful and slower).
I’m a terrible judge of how far I’ll go on a jump. At Whistler, the jumps are built to suit the trail speed. Which means if I just roll through the trail I should be good to land the backsides. And on most jumps that is how it turns out. So riding Whistler is good for both my confidence (because I’m usually landing well) and my judgement (because I can translate the incoming speed and resulting distance to experience for other locations).
I spent a few minutes trying to jump to a point. The point was a plastic marker on the landing and I repeatedly walked back up the hill to try again (called “sessioning” a jump - you should try it). I found if I jumped further than the marker required I could place the front wheel down on the marker at the right time by pushing the bike down.
As the marker moved further and further down the landing my reserve capacity got smaller and smaller until it was all I could do to make the marker - I didn’t so much judge when to land as hope my take-off got me there. It was an excellent practical demonstration of how to control jumping. I could also have moved the marker closer and had to figure out some manner of scrubbing the take off if I kept the entry speed to the jump constant. I didn’t but will try this another day.