In my opinion, the best way to scan MF film on the V750 is to scan the negatives in Vuescan, save the raw data as a tiff, and use Color Perfect in Photoshop to convert them.
Ben Anderson has a great tutorial about the workflow and settings involved: http://benneh.net/techshit/vuescan-colorperfect-a-guide/?goal=yes
I scan at the maximum resolution of 6400dpi, even though the scanner doesn't really resolve more than around 2400dpi, and downsize the images using PhotoZoom. Sharpening is turned off in Vuescan, ICE is set to the lowest setting.
I never liked the included SilferFast software. It seems to scan less detail than Vuescan, the colors required a lot of work, and, most importantly, I couldn't get consistent results.
Hope this helps,