Shimano 7800 pedals and SH-R215 shoes

I rode 15 miles yesterday with my new Shimano 7800 pedals and SH-R215 shoes, and where this pedal/shoe combination really shines is on the steeper hills where I’m out of my saddle. I feel a lot more power being transmitted to the drivetrain, and I’m in one higher gear than normal on the steep sections. My only concern is that I’m feeling some numbness at both my little toes even though I chose the wide version of the SH-215s. The numbness became very strong 9 miles into the ride, but then after a short stop at a traffic light, the pressure seemed to be alleviated. I’ve been inserting shoe trees into the shoes in the hope that they’ll widen the shoes just enough so that the outside part of my feet don’t become numb anymore.