Quick answer: Unreal Anim Blueprint additive blend with weight = 0.5 producing full effect? Additive blends in some configs ignore weight - check Apply Additive node settings.
Add a hit reaction; weight 0.5; full hit reaction plays.
Verify Apply Additive Alpha
Node's alpha input; bind to weight. Mismatched binding = full effect.
Or use a Layered Blend node
Per-bone blending; explicit weight. More control.
Audit per anim graph
Each blend's weight binding. Default may not match.
“Anim graph weight handling is per-node. Read carefully.”
If your blends don't respect weight, the binding is the bug. Document common patterns.