Space Fleet Combat Stratagems1 has this to say about worm jumps:
The wise fleet commander will endeavor to launch his ships so they all exit warp at the same time. This can overwhelm the targeting computers of any antagonists who may be waiting at the worm terminus. A radial “explosive” pattern is best as it maximizes ship dispersal and lessens the chance of damage from exploding spaceship debris.
1Volume 2, second edition, revised, with a posthumous forward by Rear Admiral Richard “Screw The Bastards” Johnson. [Spagnolia, Rigel 3B: Spignus Publishing, 2184 ECE]
May 29, 2012. druid labs pnw.