Lean back when you loft, think of yourself as a pully. Rip the bar up your shins and thighs, use your own weight to pull the bar towards you then when it hits your legs push throigh the ground and once it's past your knees squeeze your arse together.
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I had the exact same problem mate, a tip that really helped me was to get into my deadlift position and just pull the slack out the bar, the position you're in when you pull the slack is the one which you should deadlifting out of.