im also curious if versaworks has a specific setting for double sided printing. ive been able to get it to match up within about a half inch by making a mark on the end of "side a" so when you flip it you can line the mark up with the media read line, just gotta understand if theres any blank area on your artboard your printer will feed out that amount of blank area before printing so if its not needed i usually slim it down with document setup. with that said im obviously not doing it the correct way but im very new to the trade and am always open for new ideas. also you have to make sure you are using the right type of material, if its not meant for double sided printing you will be able to see thru it