Using the 24-bit color image type, you are recording only 8 bits per color channel. While that intensity resolution is adequate for printing, film negatives probably contain information beyond that. The V700 specs suggest it can capture 16 bits per channel, which may be a bit of an exaggeration. I suspect it is more like most SLR cameras, in the range from 12 to 14 bits per channel. Still, the V700 most likely is capable of much better than 8 bits per channel.
So, it may be a good idea to scan witha setting of 48-bit color.
Similarly, 35-mm film has very good spatial resolution. For example, Kodachrome 64 can capture information at more than 2500 dpi. Thus, the earlier suggestions of setting the scan resolution to 2400 or higher are worth following, if you want to get as much from the film image as possible.