Frustrated with erratic behavior

[Brady Watson]

Greg...
I prefer to move the Z to .5 or 1" and zero the Z there for an aircut. To have proper control over the depth, I recommend this method. Especially if you are teaching others.

I concur. It is much easier to convey the idea of zeroing the Z up high than it is to mess with 3D offset - which is a lot more confusing for a new user to grasp. They have enough to learn without using 3D Offset...

I instruct users to ignore the FP fill in sheet until they understand what it does.

-B