How to add a peaking system?

Hi Jeremy here! The code below spawns 2 bubbles and when it reaches 10 bubbles spawned it adds 1 and then when it reaches 20 it adds another and so on! It works great but I want to add a peaking system so that once the amount of bubbles on screen reaches a number between 100 and like 120 it will reset how many are spawning to a low number that way it never gets to a point where theres more than 120 bubbles on screen? Any suggestions would be greatly appreciated! Thanks

 #pragma strict
 
 var projectile : Rigidbody2D;
 var spawnRadius : float;
 var projectileSpawnRate : float;
 private var projectileSpawnAmount = 2;
 
 var totalBalloons = 0;
 var Initial = 10;
 
 InvokeRepeating("Spawn", 2, projectileSpawnRate);
 
 function Spawn () {
 
     for (var i : int = 0; i < projectileSpawnAmount; i++) {
            var instance : Rigidbody2D = Instantiate(projectile);
         instance.velocity = Random.insideUnitSphere * spawnRadius;
         totalBalloons += 1;
         
 //        Debug.Log("Initial: " + Initial);
 //        Debug.Log("Balloon Spawned: " + totalBalloons);
         
         if (totalBalloons >= Initial) {
             
             projectileSpawnAmount = projectileSpawnAmount + 1;
             Initial = Initial + 10;
         }
     }
 }