secret ingredient in a restaurant bolognese
If you are missing an umami note, it's possible you are missing a very common ingredient in bolognese - chicken livers. These give a meaty, almost sweet flavour. Soak them in water for a few minutes, then finely chop or pulse in a food processor. I use minced (ground) pork, beef and chicken livers.

You might also try adding pancetta, to add a smoky tinge.