Usually, drilling too shallow or having excess debris in the hole causes a spinner with not much torque at all. I'd make sure to thoroughly check and compare rear hole separation on ski and binding.
I had a template being off with like 0,5mm on an Attack and it caused the screw to get squeezed in the binding hole, could not get it completely set even with really high torque.
A quick rub with a drill in the problem direction in the binding mount holes cured the situation.