"Hopping" mobs driving me mad!

[Zandig]

I've tried so many things to alleviate this issue. Like said before, it is a z-axis issue and seems that it cannot be solved (for now and a few years prior). That is until someone brilliant comes along and takes a look at it. I believe it to be an emu issue instead of a database issue? I've tried re-writing some code to fix the issue with no success. It would be great if someone could take a serious look at this and offer some updated input outside of fixing the waypoints for each individual mob.