have you bent the ends towards the rubber ie facing the window, or have you bent them in to much? try easing them back a touch
The Whirlwind is a great tool. I don't bother dog-earing anymore. When you go down the left side of the window have the squeegee tilted like this / .....all the way down and when you go down the right side tilted like like this \ .....all the way down. I find it leaves less detailing because you are using the corner of the rubber. For some of the bigger windows I do the top and sides like this and then you can wagg down the middle really quick with no worries.