two schools of thought.The reason why I was forcing it down is to match the OBS output resolution, I have unchecked the custom resolution on the Elgato and used the control panel instead.
The buffering was always checked but was set as 0, I tried setting it to 1 there. If you mean the Elgato it's connected to a Lenovo laptop, in terms of the webcam I use the built in one on my laptop and the Elgato is in a USB 2.0 socket as instructed.
The stuttering is still happening unfortunately though.