Acacia flow just finished here in Małopolska — extract now or wait out the moisture?

The black locust (robinia) flow ended maybe five days ago and it was a good one this year — my six colonies each packed a super and a half. Problem: nights here have been cool, 8–10°C, and the bees are slow to finish it. Maybe 60–70% capped on most frames. Refractometer says 17.2% on fully capped frames but 18.6–19% on the open outer ones. I know acacia is the one honey customers want pale and liquid, and it barely crystallises so it sits in jars a long time — which makes me extra nervous about fermentation if I bottle wet. I'd like the supers back for whatever comes next (lime soon). Would you extract everything now and blend, extract capped-only, or leave it all on another week and hope the cool nights don't keep stalling them?