Might alternating between each leg for more of a focus, of one leg at a time, on the leg press. Do 7-12 reps one leg than jump to the other and than without rest back to the original leg, etc, etc, etc.
There is the system where leg presses are done before regular squats, which makes a lot of sense. Or you could do the Art Jones verson and do a set of leg extensions, leg presses and finally a set of squats. That's one cycle with out any rest betweem exercises. Than a 3 or 4 minute rest before beginning a repeat of the leg workout. That is a killer but a lot of guy's don't want to work that hard, just a thought anyway. Good Luck.