Time between postings will keep the doublepost edit from happening. Carefully thought out OPs (or posts as well) will enhance layout, and set aside editing trouble.
A fairly long OP/post is easy to follow, thus read, if it's laid out well, and not so conversational like. Although length, especially on an OP, should probably be kept as short as possible...otherwise, a fair number of readers may likely start to skim, and miss some point.