You want to make sure your one drawer that you are using for overflow is on the edge of the 12 block range that the Drawer Controller uses to find and fill drawers.
Please comment below with your own suggestions with your alternatives or tweaks to my Jaquadro Storage Drawers Network. If you have your own videos or picture series to explain your steps please give links to them as well. I will be more than happy to add your advice to the body of this post and give you credit. If enough suggestions come in, I’ll turn this post into a page!
Conversely you can go to my wiki and start a page on it.