The Nashbar rack has three attachment points:
1. top center for hole in fork crown
2. lower left for brake boss on left fork blade
3. lower right for brake boss on right fork blade.

Top's fork has one attachment point, the hole in fork crown, to which he has attached the rack at point #1.

To which he has added one P-clip on each fork leg, one holding an aluminum strut connected to rack at point #2, the other at point #3.

I propose adding another P-clip on each fork leg, one holding a second aluminum strut connected to rack at point #2, the other at point #3.

Thus the three points on the rack will be attached to the fork at five points. Here, I photoshopped it for you. Note I added only one extra strut, on the left side, didn't bother with the right fork blade.