The best white balance for Refined presets is the white balance that you are most comfortable with and works with your workflow. Either get it right in camera and editing is faster, or fix it in post and you are not fiddling with it while you shoot. We do suggest getting comfortable with white balance because it is honestly the thing that can make or break any preset.
Whether you shoot in with auto white balance, Kelvin, or custom white balance, you want to make sure the final product is the tones you are looking for. It is a personal preference but something that is easily adjusted while shooting or in post processing. That is the beauty of shooting in RAW.
We suggest shooting at middle exposure or slightly under if you have bright whites or highlights. We suggest not blowing out whites and highlights. We have strong tone curves built in our presets and profiles that help retain your highlights like film and give you full flexibility to lift the exposure or shadows to lighten the image backup.