Need help with Yanfly's Auto-Potion notetag

[Animebryan]

So I have Yanfly's Auto-Potion notetag that I'm using but after reading through it, it seems to go off every time the character takes damage, which would waste off your potion supply pretty quickly. So I was wondering if someone knew how to add a condition so that it only goes off if HP falls below a certain percentage (like 50% or 25%).

Spoiler: Yanfly's Auto-Potion Notetag

//(Requires Battle Engine Core, Buff & States Core, Skill Core, Auto Passive States & Counter Control)

//Skill Notetag:
// Make this skill react as a counter to anything.
<Counter Condition>
</Counter Condition>

<Custom Requirement>
// Set the original condition to false.
value = false;
// If the user is an actor...
if (user.isActor()) {
  // Create an array of valid potions the counter can use.
  var potions = [];
  // Add the ID's of the potions that can be used for Auto-Potion.
  potions.push(1, 2, 3, 4);
  potions.push(5, 6, 7, 8);
  // Loop through each of the potion ID's.
  for (var i = 0; i < potions.length; ++i) {
    // Get the current ID.
    var id = potions[i];
    // If the party has this potion in its item bag...
    if ($gameParty.numItems($dataItems[id]) > 0) {
      // ...then set the value to true.
      value = true;
      // ...and break the loop.
      break;
    }
  }
// If the user isn't an actor...
} else {
  // ...then the condition is automatically fulfilled.
value = true;
}
</Custom Requirement>

<After Eval>
var potions = [];
potions.push(1, 2, 3, 4);
potions.push(5, 6, 7, 8);
for (var i = 0; i < potions.length; ++i) {
  var id = potions[i];
  if ($gameParty.numItems($dataItems[id]) > 0) {
    var item = $dataItems[id];
    if (user.isActor()) {
      $gameParty.loseItem(item, 1);
    }
    this.setItem(id);
    var text = '<CENTER>' + user.name() + ' uses \\i[' + item.iconIndex + ']' + item.name + '!';
    BattleManager.addText(text);
    break;
  }
}
</After Eval>

<setup action>
display action
action effect
</setup action>

State Notetag:
// This is the ID of the Auto-Potion counter skill.
<Counter Skills: 24>
// This is the number of times the user can use Auto-Potion per turn.
<Counter Total: +20>