Crush, Armor Break, Intimidate, Fully Broken Armor Debuff help

Hi there, looking at some debuffs that I cant seem to parse on my own so I figured Id bring it here and ask some questions for anyone who might know.

Currently doing a Warbringer playthrough centering around armor break and breaking it below 0. As I understand it one can break armor below 0 causing the target to take additional damage based on base armor of the monster. However how would this interact with "Fully Armor Broken" which states targets take an additional 20% more damage. The Syzygy support gem can inflict intimidate which gives -10% physical damage reductions to monsters does appear as a separate debuff icon to armor/fully broken armor so my assumption is these do stack, but as the prior does not I am unsure. Crush says it gives -15% damage reduction to monsters but does not provide a debuff icon, is this working as intended and does it stack with everything else?

Does anyone have ideas on if this is all stacking or is something overwriting something else. Perhaps I missed it but it does not seem to indicate that anything overrides.