Gary Nelson,
I don't know if there are any secrets, but I'd offer a few observations.
Many of the bunkers are deep, some to the point that you can't see the putting surface from them. I think this is an intimidating factor and I think it puts pressure on ones approach and recovery game.
I think the yardage on the short holes misleads the player into thinking they're easy holes.
While the fairways are WIDE, the rough is difficult, causing players to become defensive, which makes the course play longer than its yardage.
There's also an uncertainty with forward hole locations with respect to carrying the ball to the putting surface or hitting it short and allowing it to run to the hole.
Some of the fairways cant from right to left, with greens that cant left to right, which usually translates to approach shots missing the green left, or being above the pin.
Some holes require decisions, like # 4.
Do you try to carry the cross bunker and deep rough on your second shot, leaving you a short distance to a difficult green, or, do you lay up, leaving you 120-140 to a difficult green.
There are subtle elements of blindness, off the tee and on second shots that unsettle the golfer.
If you miss the greens by a narrow margin, recovery is difficult.
With par at 37-36=73 pressure to break 80 is heightened, causing golfers to press.
There is usually a nice breeze affecting play.
But, I believe the primary reason the golf course resists scoring is the slope of the greens, greens that transition seemlessly from the fairways.
It's difficult to get your approach shot DIRECTLY below the hole, which is critical. And, if you're not DIRECTLY below the hole, putting is difficult as almost every putt has the slope in it.
There are also a number of greens with subtle contouring that the golfer doesn't always see, which adds to the difficulty, especially when that's combined with some slope.