I struggled with these and it took several attempts to get them right. See my comments on bread making here - https://www.lonjevity-foods.com/forum/recipes/soft-loaf-of-bread
For the benefit of anyone else having difficulties, I thought I'd let you know how I managed to make them.
I followed QueenKeto's blog post - https://queenketo.com/fiberflour-low-carb-olive-bread-buns/ - (without the olives) but with 2 tsp inulin added to the warm water and yeast. For me, the important point she makes was the need to proof twice (an hour each time) and to ensure that the initial kneading results in an elastic dough to ensure the dough rises properly and the rolls are cooked in the middle. I cooked the rolls the baking oven of my Aga (which is roughly 180 degrees) for 35 minutes and then left them to cool completely for a couple of hours.
It's also worth noting to others trying to make bread/rolls that, as Gerry says, the finished product is wetter than regular bread in the middle.