Hi,
No, I wouldn't assume that. VinylStudio's recording level indicators are accurate as far as I know. What I would do is make a recording with the recording level slider at 100 and then have a look for 'flat tops' in VinylStudio's waveform display. If you can't see any, there's no clipping happening at record time (or, at least, nothing serious).
I'm a bit confused by your use of the term 'preamp volume control'. Do you mean the sliders in the Graphic Equaliser dialog? If so, what sort of level are you seeing on VinylStudio's recording level indicators at record time?