Sorry I missed this at the time -This is actually great info, I'm interested in doing the same with mine next time I need a new rear wiper blade. Would you estimate it adds another 0.5" of length to each end, evenly? Looks like there's barely enough space at the top of my rear glass for a longer blade, and I assume the rear hatch/wiper/glass/everything is the same on our cars since we both have wagons.
today I realized my weather tech window deflectors are putting tiny vertical scratches all along the edge of my glass. it goes about 1/4 inch down all the way across. but theres nothing that looks as good as them... you win some, you lose some. the glass is already scratched so im not taking them off