katn on "[Plugin: Contact Form 7] reduce space between fields"

I took a look at your site with firebug. You don't say exactly what CSS options you tried (it would be helpful to know exactly what you've tried...) but I think this might be useful.

When I click on the Name section of your form and inspect it in Firebug I can see this:

.widget-area .widget p, .widget-area .widget li, .widget-area .widget .textwidget {
    font-size: 0.928571rem;
    line-height: 1.84615;
}

Turning off the line-height declaration makes all of the text and form fields very close together. I'm guessing reducing the value of the line-height will get you the look you're going for.