Seeking info on armor diminishing returns and how AP works

I’m wondering does the armor penetration from the shield stack with the weapons during combo?

What is the sweet spot for armor and the amount that diminishing returns start?

Does armor penetration at 40% for example actually ignores 40% of the enemies total armor then reducing their damage reduction during that hit?

How much does 1 stack of sunder add and does that stack on the shield/weapon AP?

Thank you!

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