How do I keep spaces between list items?

You may need to modify the CSS code that controls the spacing on list items — see this page re: list styles:

http://www.w3schools.com/css/css_list.asp

So you might add something like this:

ol li {
   line-height: 1.5;
}

It can also be done using margins in the above code. Restricting the change to certain lists could be done using selectors in the CSS or adding a specific class to lists you want to be different.