well i didn't get any rocking and there wasn't any daylight between cleat and shoe? i had a-three's on speedplay zero's fyi
aaaandd that's where the difference is :) just got my speedplay box out and checked the sheet and a-three's are glassfibre soles so do use the 1f+1r, but i presume your shoes are carbon sole and 2012 and earlier? and therefore use "*remove 1-f & 1-r snap shims. install 4-f and 4-r snap shims. May require "extra shim" under cleat-mounting screw of each baseplate"
If they are 2013 and later though, they should be fine with just 1-f and 1-r according to speedplay.
But, i have all the above in shims, just pm'd you