panna cotta gelatine and size/form
It depends.


If your current “sweet spot” percentage gives you a panna cotta that’s sturdy enough to hold up on its own, so that you can make clean “cuts” with your spoon, you are fine also in larger shapes.
If your preferred ratio is rather soft and creamy, so that the upside-down servings sag significantly, go up. Of course it won’t be as creamy and melty as before, you are making it more solid on purpose.


Only you know how your recipe turns out.