I have found that, in the flashcard review section, having the "flashcard x of y" data and the constantly updated number of passed/failed kanji is quite a distraction.
I end up worrying more about how many cards are left and how bad I'm doing today rather then about the kanji themselves.
Even if I try not to, I tend to continuously look at those numbers, since it only takes a tiny eye movement to see them.
My suggestion is to put an option that lets you hide those info and concentrate only on remembering the characters in front of you. Currently, I'm doing that by putting 2 small random windows over the unwanted parts, and it seems to be good for my reviews... but that' a rather ugly solution!
Does anyone else have the same problem?