I use CoolReader daily on my T1, and it's my preferred reader app.
The title bar font and size can be customized, but I didn't find a way to add a margin between it and the top of the screen. There's a
feature request forum on the project page, I suggest you ask for it there.
As for the font, I think that CoolReader has the best font display engine. You may want to try a different font ? I use LexiaDaMa and it looks great...
I can make screenshots if you want !
Also, I recommend updating to the latest version : it's a very active project, with sometimes several versions a day... You'll find they on the
project download page, latest is cr3-3.0.53_13...