Remove Player Jitter

I have spent far too much time trying to get rid of the jittering my velocity-based movement has for my player to no avail, so here's hoping someone here is kind enough to lend me a hand.

Here is a quick clip of the current status:

Player move code bit:

Code (CSharp):

1.     void FixedUpdate()
2.     {
3.         //apply breaks
4.         if (isBraking)
5.         {
6.             rgBody.velocity *= breakAmount;
7.             return;
8.         }
9.  
10.         //add our boost speed to our regular speed
11.         movementSpeed = normalSpeed + boostSpeed;
12.  
13.         //combine the user inputs into vector2
14.         //and normalize the values so diagonal isn't faster
15.         input = new Vector2(inputX, inputY).normalized;
16.  
17.         //move our character in the input direction with the movement speed
18.         //and maintain part of our previous velocity to avoid abrupt changes
19.         //and to allow drifting when there is no input
20.         rgBody.velocity =
21.             rgBody.velocity * 0.96f + (input * movementSpeed) / 10f;
22.     }

-I know camera movement can be a part of the issue, but I know my camera script is fine, and for my tests I turn off the camera movement.

-Rigidbody2D Interpolation on my character makes the jittering WAY worse. I have no idea why.

-I have tried smoothing the velocity increase differently, no improved effect.

-I need velocity based movement, but even with moveTowards or movePosition I had the same stutter.

Let me know if you have any advice on a solution to this seemingly small problem, but a frustrating one nonetheless.

 

Even the build has a noticeable jitter. Right now my camera makes the player look smooth but surroundings have that little jitter.