I don't see how it's even possible to get the bit sticking out of the cone right if you set this up under tension and I think that just as having too much sticking out could prevent the staylock from setting down, having too little could jam the cone up in a way that also prevents screwing down.
I almost always hold the eye or jaw firmly while screwing the barrel in - keeps the wire from jumping about - and have set a lower fitting on a stay that was hung at the top and then cut to fit (I can't calculate stuff as accuratly as Brion) but not attached yet.
Get some new cones, take the fitting apart and redo it. You may have to lop off an inch or so of wire to get a clean start so get some toggles or longer turnbuckles if needed.
G'luck
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