Spencer I had much the same thing happen. I think it was because I was trying to use inexperienced (no or 1 "eyes") assassins, to whom those high success rates apparently do not apply until they become more skilled. Unless the assassin comes with some natural skills already (i.e. has a few eyes right from the start), I find that almost any kill, even the easier ones, is beyond them until they build some skills on easier sabotage missions first. I had one guy who was rated "natural born killer" and he eventually had 10 eyes. He died finally of old age after wreaking much havoc.