in my opinion click pedal with springs in the rear are sub optimal for back pedaling/skidding. when i lift my feet during the rear pedal stroke i have my feet pretty mutch horizontal so i stress the front and rear of the clear simmilar.
but when braking i point the front of my shoe down and pull mostly up with the rear -> direktly against the spring in spds, looks.....where times have the spring in the front. atacs are the only mtb style pedal which workes for me, only thing which sucks is that i feel the front spring/clamp moving during the top of the pedal stroke.