A big factor is that all 4 par 5's on the North are reachable for the entire field, they are really playing a par 68 golf course with 2 sub 350 yard par 4, so scores are low. They tuck the pins on every hole of the North course and still it doesn't stop these guys. Bunkering, both fairway and greenside are only a mere nuisance for the Pro's, the orginal flashed style is more condusive to public play than challanging the best players. Ree's stlye of bunker, with the lowered floor and grass walls, is certainly better for that purpose.
It's probably time to just call it a par 70, changing #1 and #14 to par 4's. Neither can be lengthened; the 1st tee is up against the Clubbhouse and the 14th is on the border of Torrey Pines Preserve. Both would be tough 500 yard par 4's. They may have to do this next year when the Tournament will conclude on the North Course over the weekend; as stated in their contract with the USGA.