Still struggling with selling into strength

Hi Pat, I'm still really struggling with the concept of selling into strength, more specifically I have trouble reconciling it with the rules of pyramiding.  For example, if following the rules of pyramiding, I would not have a full position until reaching 4-5% increase from the pivot point.  At the same time, it seems to coincide with when we should start selling into strength...  So I can't really make sense of it.  Do I sell 10-20% into strength and at the same time buy 20% more?  I'm sure that the answer is no, so then how do those 2 things work together? Thanks, Virginie