How to customise Shoreditch?
Your question appears to be:


  When using Shoreditch, I can see only 4 contacts before scrolling. Is there a way it can be customised - apart from tinkering with the CSS, that is?


Shoreditch does nothing but modify the look of CiviCRM via CSS. So, if you're unhappy with the out-of-the-box layout, CSS is what you'll have to use to modify it.

FWIW, my opinion is that http://thereisnopagefold.com/ but I agree that Shoreditch still needs to implement some responsive design for smaller screens. I'm guessing that one of the issues holding this back is that core templates need to be modified to achieve this.