As Factor says....
My 155 sqm ASI is set with three tack lines, one each to the respective bows and one to the prodder (should I want to run tighter to the wind
in lighter conditions). Deep down wind
at say150-170, it is a distinct advantage to have the luff all the way over to the windward bow as it maintains better sail shape being a little more out from the main's draught.
Also, if I'm short handed and don't have an extra hand for the ASI, I'll set the Screecher on the bow rather than the prodder for deep down wind sailing for the same reason.