Gooshin,
I think you should separate the quality of/on the film from that of the scanner. The film you mention is made for a conventional darkroom printing. And, the flatbed scanners are -as far as I know- usually not the best tools to extract information from films.
My frustrations during the early phase of shooting with a 645N was mainly due to scanning issues.
I still like the camera, though I find little opportunity to use it routinely.
I suggest (to myself, as well!) that, if we are going to scan the film and print the digital data, we need a workflow just for this. (Which may mean using C41 films even for monochrome work).
If, on the other hand, we will be using a conventional darkroom, the workflow (not the camera!) should be different.
I guess the film you tried can be a source for excellent photos in a conventional darkroom, even while the scanned images look rather flat.
I also happen to use a Kiev88CM medium format camera and the necessity to wind the film manually (a rather tricky thing) reminds me of the sweet, spontaneous, musical, "auto" movement of the film in the 645N.