When making one's own covers, title placement, font, and size are things one must consider. For this reason, I've found it's best to stay flexible on titles until after you've started making the cover. Because you may decide that some words work better than others.
I'm still playing around with titles for the Wheel of Fire series. The second book, Neutral Ground, is now Mind Games, but I'm thinking of changing that to Mental Games for reasons relating to typography.
Book 1 is still Hostile Planet, and that won't change.
Of course, this is less important for standalone titles, because then you don't have series-wide branding issues to consider.