Grain is as a result of 2 things.
1 - ISO
Being ISO 200, there shouldn't much grain.
2 - pushing the negative/film
This will add grain too, and both of these happens to digital files as well.
(thought you said "the film and development I'm confident in." ?)
3. Pushing the actual scan.
I'm guessing number 3. OP look at the negatives and see if you have underexposed the shot (very light coloured negatives with few dark areas). They were probably very dark scans and then brightened by the scanning software giving lots of digital noise to get any detail out of them.
As for scanning they are all rubbish... Unless you spend a lot of money (like £20 a roll) even good companies like peak imaging just provide 1500px 1MB jpegs which seem to be almost impossible to remove any colour cast from as they have lost most of the data a tiff would have had. One way is to scan yourself although of the photosoc/uni don't have the equipment then you either need to buy a good scanner or use a macro lens and light box. Both aren't cheap... Film is just expensive, cheap up front costs but expensive to "run", whereas digital is expensive up front but basically free to "run".
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