Myostatin bro. Tapering up is a very good idea for him and anyone else. Just 100mg increase every 4 weeks will keep the body from adapting and keep him growing. Tapering down is stupid. Tapering up is a great idea. Ledhed has pretty much proved why this is so. One he hits peak levels as you said at week 4 or 5 his body will try and adapt. This is why he needs the 100mg increase. Then again in another 4 weeks.
Yep, that's how to do it...