@ixtab: I don't have anything against the default values on mobi books, either, what's bothering me is the fact that it's slightly larger on KF8 books at the same setting

.
(And since it's overridable on the K3, I thought it was worth a shot

).
EDIT: Err, no, I remembered that wrong, it wasn't on the K3 either, and it used the same 1/2/3 int settings. *sigh* ;'(