Definitely don't worry too much about it. I did not want to sound negative, it's just the first thing that came to mind as feedback. I haven't had the time to read the book, only had time to look at the cover, haha. :D

When one learns about graphic design, one ends up obsessing about these kinds of things. "These text lines need a tiny little bit more of space"... "Those margins are slighly too small"...

It's just job conditioning... At some point in my life I was playing the game of trying to recognize the fonts I was looking at in the adds and signs as I walking down the street.