Non Linear Contact In 3 Point Bending

Hi,

I need help with this model. I would like to perform a non-linear analysis on a composite specimen. It's a sandwich panel with honeycomb core, modeled as mat9 ort with two plies of carbon fiber per side.

The main issue is the contact between the punch and the panel, the same as the one with supports. I'm not able to model them correctly. I've thought  to use the contact slide but the results does not have sense. I have compared this with real test and the reaction force on the punch is more than 12 times bigger than reality. Looking at the results plot, It's clear that contacts behavior is not acceptable. Can you please help me? 

I attach here the .hm file.

Thank you!