Changing a list or library Header/column size

I have a frustrating problem with our libraries. 

The views are too wide to see clearly all the info on a standard screen.

Example

As you can see many of the fields are just two characters. 

What are my options ?

I wish I could turn the column header text vertically.

Reduce the size so the deader text is partially obscured on render.

I've been playing with view and column formatting but so far can't manage to reduce those columns. Any clues out there?