I can't translate, but noticed that Page 27 of the Hs 129A-B Abwurfwaffee.pdf you link to has these numbers listed:
10m / 85 degrees
50m / 78.5 degrees
100m / 74 degrees
200m / 68 degrees
We know with the 2 second fuse that the 10m option is a no go. But the others,
we can use bombsight table 2 to back into the required IAS. 280 kph seems to be the magic number for the rest. I haven't tested yet.
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