After a little digging around, I found the extra blades I ordered back when from Tischer, and installed them. They look rather perpendicular to the glass, so I didn't have to delve into twisting after all, at least for now. I guess the 14 month old blades were worse for wear after all. These are the easiest wiper blades to install I have ever come across. After the tab is depressed to release plastic cover, they literally slide right on.
BTW, the box says the right blade is 18". I measured to double check, and both the old and new blades were 18". I didn't think to check for extra clearance, but I imagine 19" could probably work fine. I'll try to make a mental note to see how the clearance looks next time. (Does the vert have a differently shaped windshield by any chance? The thought never crossed my mind before.)