Mind muscle connection / form > desired rep range whatever > amount of wt. I don't even count what wt. Just feeling the muscle and hitting it hard and knowing if I want to stop before failure or go beyond (always one or the two options) in all exercises . People get too much caught in leg press wt. Feet higher and wider u r using the whole glut ham quads pelvic girdle the whole lot. Huge huge wt disturba the neuro muscular coordination and the goal then become move it up and down somehow , point a to point b business. The feet lower at the platform quads and much closer is quads. Explosive concentric not locking the knee , hold peak contraction and slow eccentric ( think compression a coil/ piston pump). Amount of wt will drop significantly if this is followed and quad stimulation will occur to a greater extent.
Leg press is like shrugs for many many people lol just load up crazy wt and go up and down somehow not a wise idea. It's like u r standing against a brick wall and a car is pushing u to crush u against the wall and u r thinking and fighting with all your power and strength to push it back. Similar sort of thing in the mind on leg press if crazy heavy wt is used beyond what one can handle legitimately with good form and targeting the desired muscle.