It is natural that the lower spreaders are more likely to sag. Part of the trick of no sagging is when the spreader holds out an angle in the stay. Then the spreader can be cocked to bisect the angle. Stays in place more readily. But the lower spreaders don't always have two stays passing, one angling in to the base of the upper spreader and one going straight up. And even when they do, fixing in place can be hard.
Spreaders with an open slot as pictured often are fitted with a screw-on end plate to hold the stay in place. If there's a couple of screw holes already there, it was anticipated and the plate is missing. If not, consider making one.
It still helps to sieze the wire, build it up a bit so that whatever you then use to hold the stay in place, whether end plate or other siezing to the tip, will have something to grip on.
G'luck
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