Which optional rules do you use for muscle-powered weapons and armors?

[Sorenant]

I'm referring to optional rules (or house rules) about adjusting muscle-powered damage, weapon types, armor types and how they interact with each other. Like KYOS for adjusting damage, Armor-Piercing Weapons, Blunt Trauma and Edged Weapons and unofficial solutions like applying AD(0.5) to swords or AD(2) to spears.
It's an old subject and both "is there really a problem?" and "if so, how to solve it?" has been debated over and over in the past but I'm curious to know it stood the test of time.

In my case KYOS has been enough to solve most of what I perceived as problems but I also let Armor-Piercing Weapons to let spears shine and use alternative values for some armor types. Other than that, I indirectly buff unbalanced weapons by allowing cinematic traits like Weapon Fencer and Equilibrist.