Probably not a good idea. You still need to progress the weight and doing a workout with a weight calculated to fit in the fifteen or ten range with only five reps might not give enough time under tension. The rep scheme is artificial, it's just a construction to allow for the increasing weight which at some point will cause a drop in reps anyway. It's also a convenient way to look at the workout sometimes be breaking it into those smaller microcycles, but overall the rep range is irrelevant.Here's a suggestion someone might want to try as well. Instead of having each bodypart following the same rep and volume cycles why not have them each start at a different point in the total cycle. Such that you may be doing 15s for your quads but 5s for your hamstrings, just as an example. This would likely make each workout a little shorter (only marginally) and help keep things from getting too monotonous. Just a thought.