MSC NASTRAN View factor calculation

[AACING]

Hello !

I am trying to test out all the view factor calculation methods supported by MSC NASTRAN, but none of my tests give coherent results.

I have tried :
-Finite Difference algorithm (VIEW+,RADCAV NEFCI=FD),
-Contour Integral algorithm(VIEW+,RADCAV NEFCI=CONT),
-Gaussian integration (VIEW3D),
-Hemicube Algorithm with 500 and 5000 pixels (Nlmopts).

I don't understand why there are two values of view factor sum per element in the f06 file, but regardless of that, no combination gives results anywhere close to the theoretical ones.

Any tips ? The files and reference values are in the attachements.

Thank you in advance for your help.
A.