When you select the SCART setup you are first asked to set the desired setting for the TV SCART, this will be Composite, S-Video, RGB, YUV, once selected you will then be asked for the setting for the VCR SCART, this will be S-Video or Composite, once complete you will be asked if the change is ok.

Only the TV SCART supports RGB or YUV (as well as S-Video and Composite), the VCR SCART only supports S-video or composite.

As for poor picture performance, I have viewed a DTH335 today running component, I saw no issues of concern.

Cyril