Try using a two-step lift to get a full range of motion.
When you start the exercise, come up about halfway, pause, shift your ankles around a little, then finish up to the top.
There is a sort of realignment of the ankle joint partway up - with a little practice you'll be able to feel exactly where it is and how to shift your ankles. This little shift will help you get past the sticking point and get a stronger, more complete contraction in the calf muscles.
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