Use some bands. A high amount of band tension relative to straight weight. Two doubled mini bands, one for each foot with 135 total straight weight should do the trick. Do anywhere between 6-12 singles. Every minute on the minute or EMOM.
Make sure you're also doing regular work in addition to the above.
Many great suggestions for assistance exercises.
I didn't see much for cues. I think what might help is when you get to that sticking point, really ram your hips forward into the bar while pushing your upper back backwards. You know, like your hate fucking your favorite porn star.