So there’s no need to drop my current weight by much , only the overall volume

correct

So say I do 3 sets for a movement.. cut it down to 1-2?

Just do 5x5 @50%

Fuck

I also drop to 50% or just use the whole week for stretching and relaxing. I try to time it for when I'm traveling to places that have no gym anyway.

So many different opinions

what are central and peripheral fatigue?

cns and pns/skeletal muscle respectively

how does the cns get fatigued? how does skeletal muscle become chronically fatigued?

Cns has been shown to have reduced excitability following prolonged tetanus contractions or ultra-long endurance activities.

Contractile units being damaged in terms of chronic.