while loop & array- turn on something via percentage

Hello Everyone,

I am currently creating a script that makes rocks fall one at a time by the amount of percentage is complete.

The problem is, it can only be done on very specific numbers. (currently = modulus has to equal zero to turn on falling rock). while the script is able to handle any number of rocks, if I change the speed of how fast the percentage goes up, it can skip rocks, making them fall out of order, or not at all.

Is there a way I can re-write the while loop to have it drop each rock based off of percentage and the number of rocks I have?

The while loop is under the refillRate() method. Here is my script:

 #pragma strict
 var rate : float;
 var curProgress : float = 0;
 private var maxProgress : float = 100;
 private var drawGUI = false;
 private var percentOfProgress : float;
 var progressBarLength : float;
 private var maxProgressBarLength : float = 100;
 
 var progressTexture : Texture2D;
 var progressTextureMain : Texture2D;
 var canDecrease : boolean = false;
 //var screenup : float;
 //var screenside : float;
 var excavateStyle : GUIStyle;
 var rocks : Rigidbody[];
 private var check : boolean = true;
 private var i : int = 0;
 private var percentage : float;
 
 function Start () 
 {
 percentage = (100/rocks.length);
 }
 
 function Update () 
 {
 if (drawGUI == true && Input.GetKey(KeyCode.E))
         {
             refillRate();
         }
 else if (canDecrease == true)
         {
         defillRate();
         }
 
          percentOfProgress = curProgress/maxProgress; //current % in decimal
         progressBarLength = percentOfProgress*100; // current %
     if (curProgress > maxProgress)
         {
         curProgress = maxProgress;
         }
     if (curProgress < 0)
         {
         curProgress = 0;
         }
  
  
 }
 
 function refillRate()
 {
         curProgress+= rate/100;         rocks[0].isKinematic = false;
         
         while(progressBarLength % percentage == 0)
          {
          //rocks[i] = GetComponent.<Rigidbody>().isKinematic = true;
          
              if (check == true)
              {
              check = false;
              i++;
              rocks[i].isKinematic = false;
              yield WaitForSeconds (0.1);
              check = true;
              }
              else
              {
              Debug.Log("out of range/time");
              }
          
              if ( i >= rocks.length-1)
                  {
                      i = 0;
                  } 
                  
  }
 
 }
 function defillRate()
 {
         curProgress-= (rate/100)/2; //fills up the progress meter.
 
 }
 function OnTriggerEnter (theCollider :Collider) 
 {
     if (theCollider.tag == "Player")
     {
         drawGUI = true;
     }
 }
 function OnTriggerExit (theCollider :Collider) 
 {
     if (theCollider.tag == "Player")
     {
         drawGUI = false;
     }
 }
 
 function OnGUI()
 {
 
     if (drawGUI == true)
         {
         GUI.Box (Rect (Screen.width*0.5, Screen.height*0.3, 300, 45), "Hold E to Excavate",excavateStyle);
         GUI.DrawTexture(Rect((Screen.width/2.5), Screen.height/10, maxProgressBarLength *Screen.width/650, 50), progressTextureMain);
         GUI.DrawTexture(Rect((Screen.width/2.5), Screen.height/10, progressBarLength *Screen.width/650, 50), progressTexture);
         }
         
     //calculate bar length, based off of how much is completed.
 
 }