I had them all at 100% viewing. The WoF tiles are "ok". I think they could have stood to be about a smidge wider, maybe a millimeter if that. BUT, both the Wells sheets, the tiles were way too small, like I'd say at least a quarter of an inch on two sides. The loss of the two sticker sheets isn't that bad, but how do I fix this? I assumed (perhaps ignorantly), that viewing at 100% would be what I needed to do. I'm not even sure if the viewing % alters the how it prints though. What's the best way to make sure the tiles actually print the right size?
No, viewing at 100% or changing the view zoom will not make a scrap of difference to how the tiles print. Check your printer settings. I imagine that you are not printing at 100%. Uncheck any 'Scale to fit' box and check for a 'Print at' setting. Adjust to 100% as necessary.
When this is done, print a test page. If all goes well the tiles will probably be perfect, if not, go back to the printer settings and adjust in small increments until a test printing is the correct size.