It would be nice to see the negatives from the prints you posted. The negatives you posted don't match them.
I'm seeing some fogging/light striking on the prints, which may or may not be on the negatives.
Overexposure pushes the highlights up past the point where the values have good separation. Whites look pasty and featureless. Overdevelopment makes the negative too contrasty.
For overexposure, you need to print longer to get through the base fog on the negative (this is what's meant by "printing through the density") and maybe try to burn in the highlights. Using a higher contrast setting generally or to burn with may help, but the print may never be satisfactory.
With overdevelopment, you need to use a lower-contrast setting/filter to counteract the increase of contrast in the negative due to excessive development. Often, exposure times will be longer too.
Have fun and learn from your trials

Printing perfect negatives is easy; it's the hard ones that make us better printers.
Also, it teaches us to refine our exposure and film-development techniques.
Doremus