Mesh Offset Direction Issues

Hi everyone,

I have encountered a problem regarding the directions which mesh offset works with for multiple surfaces. My geometry is particularly organic therefore making it not easy to offset the mesh in any other way than to join all the geometry together in the script and to either mesh offset or weaverbird thicken.

The geometry is created using twisted boxes (box morphing) and each 'pod' is built up of 4 twisted boxes connected together. Each twisted box morphs a quarter of the geometry  (I found this was the best way to achieve what I needed and the associated points give me greater control). 

So when I come to offset them some quarters go in one direction and some go in the other. Does anyone know perhaps why this is and how I can solve it?

Just for added information: I have created all the quarters in exactly the same manner, including the sequence of which points I select to morph into a twisted box. It was after this point I gave up and started looking for help!

I have tried unify mesh normals and most of the other standard advice that gets offered around the forum, but as the usual responses to these, it still provides the same results. 

Thanks you in advance for anyone that can help!