For my ends I usually build a double H brace. The first post being 10-12" X 8' and the others being the same size as the line posts. Then I use one continuos brace wire, stating at the bottom of the end post going to the top of post closest to the rest of the fence. I use a double wrap of hi tensile in a double figure 8 pattern with a regular fence tightener for tension. As many as I've built I don't have a single picture to help describe what I'm talking about.
Wow... I understand what you are saying. That baby shouldn't move. I may try that myself.
Thanks.....