Pull the slack out of the bar, you should get into position and push your hips back further, not lower, just further back.
You should feel like you might fall over backward, and that's when you bring your hips into the bar firing up as hard and fast as you can.
Take a look at your head position too, the second you start the lift your head tilts up, keep it neutral the whole time if you can. Watch the eliteFTS so you think you can deadlift videos, you're technique isn't terrible. Some small tweaks and continued work will result in bigger pulls.