Steve,
Creating a reverse profile in LR for dealing with negatives doesn't work very well. The approach I described in the Camera Scanning article works far better.
SilverFast cannot create graininess in film scans, unless you had sharpening settings set too aggressively. The scanner you are using makes a difference. A Nikon 5000 will emphasize grain more aggressively than an Epson V750/850, for example. In any case I don't recommend sharpening in any scanner software.
If you batch-scan the negatives with SilverFast and just want to see what the image looks like in positive before making selects, you can do that very quickly in batch scan mode without wasting a moment on specific settings - only select transparency-negative as the scan mode so SilverFast "knows" to make it a positive result.
