Hi John,
To my mind the real question is whether you can get sufficient luff tension on the genoa--bearing in mind modern sails need far less than when I was a lot younger.
No doubt you found Charles of Hyde helpful when ordering, so why not talk to him about it?
I have not yet hoisted my new No 1, but the blade goes up the foil on "Cascada" about the same distance as your photograph shows. I don't have any worries about it.
275/30 "Cascada"