I never had any luck with the staggered screw pattern over the years on the front tires, maybe I'm not angling them like I should. Only one screw ends up doing all the work for some reason and the staggered screw next to it just floats. You can tell by pulling the screws out of the tire and you will see what screws are doing the most damage to the knob. Staggering the screws in the back works great.
I'm not sure why the front works but virtually everyone I ride with has that same exact ed-11 front. 2 guys that rode mine couldn't believe how well the front gripped and handled braking and they have the same tire so maybe I just got a good one who knows?? Was only my 2nd time out but I'm picking things up fast and hanging with everyone!