High Cauli,
ONLY LST!!! You do NOT top an autoflower, this does increase the yield. They do not have enough time to recover.
What you want to do is to use LST and bend all the buds that grow higher then others down. When you've got every bud at the same heigt you want to bend them in a shape that the leaves do not stack on eachother. And when you look from above you want the plant as a screen of green. The ideal plant does not let light get wasted and the light from the lamp should not reach the ground. But you want enough space in between leaves that they are not stacked on each other, blocking airflow and stop moist from escaping.
So bend the plant in a shape that all the buds grow on the same height, receiving the same amount of light from the lamp and all grow equally fat, sticky and juicy!
Happy Growing Buddy! 💚