OK gang, my Yosh fender eliminator doesn't keep my back and helmet from getting peppered or sprayed by the elements, same as yours. Well I saw this
Black Plastic Fenders Rear Splash Guard for Motorcycle | eBay on E-bay and will see if I can graft it on. Has nice beveled contours like the Ninja. For 7 bucks what the hey. I'll post up some pics when I get done. Ships free from China so might have it on (or not) by Thanksgiving. Wish be luck.