Giant AI and Movement Speed

So I'm working on a plugin that will have the ability to change the movement speed for mobs, however I cannot seem to get giants working. Any ideas?

With zombies, I just had to adjust the aggro radius using a custom Navigation class and then calling nav.a() with my desired speed. With giants, it's not working however.

Any insight? I'd be glad to post some code if you think it would help.


Thanks!