It's possible that the tenion in the mast step should be wedged foreward or the wedges at the partners adjusted to shift the mast aft to get the jibstay at least not floppy slack when the runners are not set up - assuming that there's some reason for not just tightening the headstay a little.
But on boats that I've had with runners, I always set them when at anchor, dock, under power or on the drift. Just seems better to keep some opposition to the jibstay.
G'luck
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