Roller Reefing Headsail - Hard turning

That is not entirely correct. If the backstay or aft shrouds are not tight enough the forestay can sag considerably & the aluminium foil cannot stop that. That makes it harder to rotate.

Ok. I was assuming (perhaps rashly) that the forestay and backstay were already properly tensioned so as to keep the profile from sagging. Once that is established, what I wrote about too much halyard tension holds true - according to the recommendations by Facnor (previous boat) and Goiot (present boat).
 
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