Issue with camera script

Im having an issue with my camera script (posted here as well)

There is a jitter/shaking that happens when my player lands from a double jumps. The reason behind double jump (vs single jump) is that the camera actually moves up. Where as a normal jump the camera stays grounded to the bottom wall game object (basically my half screen buffer doesnt get hit... 'delta' I think).

How can I get rid of this shaking/jitter? To better explain "shaking/jitter" I would say its like a giant hitting the ground and causing it to shake (go up and down).

Code (CSharp):

1.  
2. using System.Collections.Generic;
3. using System.Linq;
4. using System.Text;
5. using UnityEngine;
6.  
7. namespace TikiBeeGame {
8. class EndlessLevelCameraController : MonoBehaviour {
9. //public float speed = 2f;
10. public float dampTime = 0.15f;
11. private Vector3 velocity = Vector3.zero;
12. public Transform rightEndMarker = null;
13. public Transform leftEndMarker = null;
14. public Transform topEndMarker = null;
15. public Transform bottomEndMarker = null;
16. public bool useFixedUpdate = false;
17.  
18. private float leftWall = 0;
19. private float rightWall = 0;
20. private float bottomWall = 0;
21. private float topWall = 0;
22.  
23. void Start() {
24.  
25. }
26. void updateWalls() {
27.  
28. leftWall = camera.WorldToScreenPoint(leftEndMarker.position).x;
29. rightWall = camera.WorldToScreenPoint(rightEndMarker.position).x - Screen.width;
30. bottomWall = camera.WorldToScreenPoint(bottomEndMarker.position).y;
31. topWall = camera.WorldToScreenPoint(topEndMarker.position).y - Screen.height;
32. }
33.  
34.  
35. void LateUpdate() {
36. if (!useFixedUpdate)
37. updateCameraPosition();
38. }
39.  
40.  
41. void FixedUpdate() {
42. if (useFixedUpdate)
43. updateCameraPosition();
44. }
45. // Update is called once per frame
46. void updateCameraPosition() {
47. updateWalls();
48. if (PreferencesManager.CURRENT_PLAYER.transform) {
49. Vector3 delta = PreferencesManager.CURRENT_PLAYER.transform.position - camera.ViewportToWorldPoint(new Vector3(0.5f, 0.5f, 0)); //(new Vector3(0.5, 0.5, point.z));
50. Vector3 destination = (transform.position + delta);
51.  
52. //destination = findBestPlacement(destination);
53. if (destination.x > rightWall) {
54. destination = new Vector3(rightWall, destination.y, 0);
55. }
56. if (destination.x < leftWall) {
57. destination = new Vector3(leftWall, destination.y, 0);
58. }
59. if (destination.y > topWall) {
60. destination = new Vector3(destination.x, topWall, 0);
61. }
62. if (destination.y < bottomWall) {
63. destination = new Vector3(destination.x, bottomWall, 0);
64. }
65. }
66.  
67. // here to always set the Z
68. destination = new Vector3(destination.x, destination.y, transform.position.z);
69.  
70. transform.position = Vector3.SmoothDamp(transform.position, destination, ref velocity, dampTime);
71. }
72. }
73.  

p.s.
I also have been looking for a tutorial on the Achievement and Leaderboard api's if anyone has a link