How to zoom in a particle effect in XNA 4.0?

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C#

XNA

XNA4.0

I have a sample code for particle explosion here. I tried to move the camera away and zoom explosion 10 times. This is my code. In my code I changed following:
In class ExplosionParticleSystem.cs. I changed:

settings.MinEndSize = 700;
 settings.MaxEndSize = 1400;

In class ExplosionSmokeParticleSystem.cs. I changed size:

settings.MinStartSize = 70;
 settings.MaxStartSize = 70;

 settings.MinEndSize = 200;
 settings.MaxEndSize = 400;

And class Game1.cs. I changed the camera position:

Matrix view = Matrix.CreateTranslation(0, -25, 0) *
                     Matrix.CreateRotationY(MathHelper.ToRadians(cameraRotation)) *
                     Matrix.CreateRotationX(MathHelper.ToRadians(cameraArc)) *
                     Matrix.CreateLookAt(new Vector3(0, 1000, -cameraDistance),
                                         new Vector3(0, 0, 0), Vector3.Up);

The problem is when I zoom it up.The explosion was drawn worse. You can see when you run my code.Have any solutions for this problem??