What manifestation lore is best for maggotkin?

Hi all. What manifestations are people seeing success with?

The ones that appeal to me most are:

• Purple Sun: nurgle generally has poor rend, which the debuff aura really helps with, and the attacks are decent. Difficult to cast though.

• Lifeswarm: nice for healing on our big monsters, easy to cast and keep out of danger.

• Shackles: nice to splash some mortals and to slow our opponents. If we can't be fast, we slow the enemy down instead. Also it works immediately after summoning which is nice.

• Chronomantic cogs: good protection for our large monsters, as all are wizards. Charge bonus also helpful for our slow units.

Any thoughts? I've been thinking maybe Rotigus is actually better than he seems due to his casting bonus, and therefore ability to summon quite well.