I have experimented with different curves on the ends. Curves change the lay, but I don't think they do much to fight the calf ridge, other than changing your direction.
The calf ridge is created by the weight of your torso. Due to its weight, it's pushed deeper into the fabric. Your legs are lighter, that's why the fabric is not stretched as much. The only way to prevent the effect completely is to use a fabric that doesn't give much under your torso. Polyester has very little stretch; my 1.4oz PolyD and 1.6oz ripstop polyester hammocks did not have noticeable calf ridges. But they also don't feel as nice to me as nylon. With the 1.6oz ripstop polyester I felt like lying on a concrete floor.
In my opinion the best way to deal with a calf ridge is to move into a position in which it doesn't bother you. You can achieve this by either going more perpendicular or inline. If you go more perpendicular, the ridge is under your upper legs, which are heavier and less sensitive to the pressure. If you go more inline, your legs touch are greater area of the ridge and the pressure is distributed better. Of course there are other tricks as well, like pulling the fabric tighter or using a pillow.
Curved ends on the hammock like this ) ( will relax the sides somewhat and enable you to lie more perpendicular - so you might solve the calf ridge problem this way.
One piece of advice, though: don't make the curves deeper than ~0.6", otherwise you'll create a new ridge, running along the center of the hammock. Not very comfortable.
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