Where are the ePubs from, is it a specific publisher or store?
The best way to remove the spacing is probably to change the .epub extension to .zip and then edit the style(s) that are causing the space. You can also explode the ePub in Calibre and get access to the files contents that way (right click on the book and select Tweak Book). The other way to edit things would be using Sigil.
If any of the files are public domain post or link to one so someone can take a look.
Last edited by AnemicOak; 05-26-2012 at 04:09 PM.