from the ProMod site:
"For the best results in combat, attack only when your CSC is strong and your opponent's is weak. Resist the urge to swing blindly when your opponent isn't within view, or is cloaked by Mind Trick. Constantly circle your opponent, and switch directions often to prevent them from getting a strong lock on you with their crosshair."
This would lead me to believe that timing of the button press is what determines bonuses... yet cjais says it is the moment of contact.
Rather than having us speculate, could the ProMod author simply explain the mechanics?