I don’t have any direct experience with NikonScan, but I have chatted with a number of users who do, and can provide a few tips.
First, I understand that NikonScan has the ability to scan to .NEF files, but my understanding is that Lightroom can’t really interpret these properly, so you are probably better off sticking to TIFF for use with Negative Lab Pro.
Second, it’s recommended that you set the gamma to 2.2 for the scan.
Third, at least in the examples I’ve been sent that were produced with NikonScan, I get the best results starting off with the “Linear + Gamma” tone setting in Negative Lab Pro. And in some cases, you may have to make significant adjustments to “brightness.”
I hope to do a deeper dive of Nikon Scan in the future, but in the meantime, hopefully other users can jump in and offer tips!
Hope that helps!