In editing, the first reading of a manuscript is the all-important one. On the second reading, the swampy passages that you noticed in the first reading will seem firmer and less draggy, and on the fourth or fifth reading, they will seem exactly right. That's because you are now attuned to the writer, not to the reader. But the reader, who will read the thing only once, will find it just as swampy and boring as you did the first time around. In short, if something strikes you as wrong on first reading, it is wrong, and a fix is needed, not a second reading.