I suppose, this happens everytime u're FCin map, that's really ur limit(or so). So I'll suggest playing maps like that one(and that one as well), or even harder until u'll be sure that u can FC it without real troubles.
As for me I can't FC maps that are even close to my limit cuz of being very nervous in the end like "wow, i can do tha...damn it, fail again", even if I can pass all of map's elements like 9 of 10 times =\ I wish there were any other solution exept improving skill to next "point" or some drugs=\