JacKull, wish I could weigh in, but I've never used that library. Mercifully, with Roland, Kurzweil, Vitous, Garritan, Project SAM and VSL, tuning has never been an issue.
Nick, do you ever put only a room reverb on a VSL instrument in an orchestral mix?
I'm tempted infrequently to do it for clarity's sake. But logic tells me that no orchestral recording has secreted away one instrumentalist in a small room. Moreover, VSL was recorded uniformly, in the same space.
I'm also afraid this kind of a trick is a cover for bad orchestration. That is, if a flute line isn't coming through after a reasonable amount of tweaking, putting a room reverb on it (while the rest of the orchestra is dripping in a large hall) is not an organic solution. Yes, in the end we trust our ears, but there is such a thing as a sonic band-aid. We may solve a short-term recording issue, and our ears approve. But as an orchestrator, I might have missed an opportunity to learn.
I think I have a purist assumption that, if I'm scoring correctly, the room should pretty much stay the same. And that would seem to be particularly true of VSL. But I might be wrong.
Anyway, I value your feedback.