I'm using Moi for 3D printing a lot. Never had any real issues.
The setting you are looking for is: Divide larger than.

My usual settings:
Angle 1 - 3 depending on the printer i'm using
Divide larger than: 1 mm
Avoid smaller than: 0.1mm

I always check the stl in Netfabb.

I hope this helps.

Dinos