Henry, nice shots for a hand-held, reversed lens. Have you thought about getting some extension tubes, that way you don't have to hand-hold anything and your focus will be a lot easier. If you do get some try the Kenko ones -
Kenko Auto Extension Tube Set DG for Canon EOS Lenses AEXTUBEDGC - as they allow the lens and the camera to communicate with each other so that your AF is usable. They are a lot cheaper than a macro lens, but they will still allow you to do macro work with your existing lens. These are what I used when I first started doing macro years ago.
WesternGuy