Ok maybe i have missed something but i dont remember this being discussed or announced anywhere.
The standup layered armor plate II used to apply a bonus of 20% not 15%.
Also, there was no module stacking penalty.
EDIT : i see they have added this in the description, over the patch
Multiples of this module or similar modules that affect the same attribute on the structure will be subject to diminishing returns.
Again, anyone has seen this announced anywhere ? it results in a huge nerf for the powered structures.