Is there a way to make ALL my PDFs print at 100%?

I create a very large number of forms and documents, the final product of which is always PDF. I really need for them to all print at 100% with normal looking margins rather than reduced with gigantic margins. Apparently when my clients are using Reader on a PC, the default print size is "scale to page size". If I want to override the PC print default of "scale to page size" I have to go into each and every PDF (hundreds of them) select Properties > Advanced > Page Scaling and change from "Default" to "None" which then forces me to chose a page range. It's pretty tedious to do that 50 times a day. It's annoying to my clients to get a reduced printed document if they don't remember to change that default every single time they print a file. Is there some place in my general Acrobat Pro Preferences where I can make all PDFs I create print at 100%? Is there a  plug-in?

I am working on an iMac with Acrobat 11. I just don't have the time right now to learn an all-new interface. (unless it solves this problem)

Thanks,

Amy