We often read comments to articles that recommend the author use the Bridge Winners hand diagrams and auction diagrams. I am one who finds these tools to be big aids in improving the readability of an article.
To help increase the usage of these tools, might you consider something such as a reminder box popup when an author chooses "Create Article" asking the author to use those tools? Of course, the reminder should be politely worded. And might also possibly be linked to some sort of instruction about how to use the tool.
Plus... it's free!