Try changing the refresh rate, as Peter suggested. You can't say for sure that the problem has nothing to do with the refresh rate if you haven't tried it.
If I'm remembering correctly (it's been a long time since I purchased my Touch) the default refresh rate is 6 pages, so 5 out of every 6 page turns there will be some ghosting on the screen, which can make the screen as a whole less than crisp.
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