Its rider size and how much hull area behind the center of gravity that determines how difficult it will be to get planed. Little guys can ride anything, big guys will need either more aft area or be able to crawl farther up on the ski in order to ride away. Often a little negative trim makes it easy.
When I ride my xfr around. It almost never fully planes out. Like you mentioned. How much the pump sticks out the back has alotnto do with it. The pivot point is the end of the nozzle.
I think alot of it is old school guys learned to ride a different way that doesn't translate to today's freestyle or riding. Flat water riders brap the theottle on and off rapidly. This dynamic totally changes how a ski rides. You don't sweep the steering under power. You adjust the steering in between theottle blips and use minute steering adjustments to keep the hull under control. It's always on the edge of losing control.
550. 650. 750. Superjet riders. All learned to ride 2 feet back. Lean in trunk and power through the whole turn. Keep the ski hooked up in the rear. Plane it out. And have fun doing tray and hood tricks
2 totally different types of riding and why I say a shory am hull can be ridden all day long and not fatigue the rider. If he has developed the riding skills.