It depends how you exposed your negative how the blacks are going to look in your print. The old adage of exposing for the shadows and developing by the highlights really works.
If you find you have enough shadow detail in your negs when you print to maximum black through the film base, then adjust the development time until you have highlights that print with zing. If you're not happy, you did something wrong.

I would do a test. Expose a set of negatives at +2, +1, normal, and -1 stops of the ISO of the film. Develop them all according to your standard time. Then print them all until you print through the film base to be black, and judge the shadows in the print area. Pick the one that looks best.
Now expose a set of negs according to that exposure index, and develop them at different times. Say that the first neg you liked for its shadow didn't have enough contrast, you could try adding 10-15% and keep doing so until you have a negative that you find prints well in both shadows and highlights. Your midtones should fall into place as you do this too.
If there's too much contrast to begin with, decrease development in increments until you hit the sweet spot.

A good negative is one that gets you a print that you are happy with. Throw rules out. Figure out what you like and keep doing it your own way for the greatest reward.

- Thomas