Tempo, way you didn't change ED? :P
It must be very hard to broke ankles near to Uke... maybe you should change ED this time and try again?

About second replay, before kick you should moved lumbar to left site (left bending lumbar), then this kick would be better, more accurately

here is my replay from boomhit challenge:
http://forum.toribash.com/attachment...6&d=1249505228

also, I did this short one with sambo gravity, maybe it looks realistic: