Image tracking jitter

Hello,

I have been experiencing an issue where the 3D model will have a jittering effect (flicks through rotation angles and position coordinates) when the device camera is facing directly onto the image to track.

Due to the size of the model compared to the real world image to follow, I am needing extended tracking enabled but have read that is may be the cause of the jittering.

I have created a damping system to smooth out the jitter to moderate success, as in it is working but the jitter is still present.  This was done by unparenting the 3D model from the Image Target object and writing a script that would copy the position and rotation of the Image Target in a Vector3.SmoothDamp and Quaternion.Slerp.

I have tried the Render Over Native UI toggle in the Resolution and Presentation options but that didn't show any changes.

I should also mention I am building this for both Android and iOS platforms.

Unity: 2019.4.15f1

Vuforia: 8.5.9

Is there any way to remove the jitter to have the model completely stable?

Thank you for any help with this matter.