Craig –

The Particular smith machine I use is unlike most and very much like a free weight bar in that it provides zero assistance or “spring”
The only thing it provides is a linear plane of motion.
So fortunately when you un rack it, the pins have no swivel or spring to try and fall back into place.

In your case, I would just aim to get under it and the bar rolled back into position and “locked in” at the top of your delts and grip in such a way to keep it in place
If you have a partner they could also assist this

Also, if your range of motion is in a consistent line and not wobbling and you are controlling through your quads I don’t think you should have much problem