1st for all of you ES = Endo-Steel InternalsFF= Ferro-Fibrous armor
We all know there is no FF armor and no ES in this mod, mostly due to lack of critical slot system and even with such a system, some people see this technology as a cheat for mounting more weapons, armor and equipment to light and medium mechs even though they consume space and cost a lot more then standard issue equipment, mostly because light and medium mechs mount so few weapons the extra space consumption is irrelevant. On the other hand XL engines are considered balanced because it makes mech more vulnerable (by opening their destruction trough side-torso damage).
So I have the following idea: since FF and ES are considered bulkier I recommend we apply a similar weakness to them. If you lose all armor on the component you lose armor on an adjacent component (you left arm armor is destroyed - you now lose 25% of you armor on your left torso or 12% on LT and 13% on left external) and once that component is destroyed completely you lose 25% of internal structure on an adjacent component. That way going for costlier tech that grants free tones is risky since you will have to protect you components better.
The alternative to that is adding damage transfer as a multiplayer, but that would be less useful since your arms and externals fall off when destroyed.