I don't think you are going to get me to see the submissive positon the peek generates in an advantegeous setting. If you must clear past certain obstacles such as small rooms or hard corners then do so from a point of dominance using the Press Out technique or other suitable technique. It works and makes the peek pretty much useless.
It doesn't matter what the mission or whose name is on the check you recieve. Everyone bleeds the same color, so the point is to avoid excessive spillage of your own don't employ the peek when other techniques are superior and easier. Then again, it is your choice.