I am a die-hard conventional deadlifter (long arms and legs, short torso) and the thing that helped me the most in hanging on to a big deadlift is rack lockouts. They do not really help me in any other way, as I stick on the deck and always will. I started out as an OL'er and have always had a strong second pull, so now my deadlift speeds up as I get closer to lockout. Speed being relative to the weight, of course.
My wife pulls sumo, and she has to time her dive with her hips when pulling or she sticks on the deck. If her timing is off, she winds up with bar out in front of her, and you can pretty much guess what happens here.
One exercise that really helped her learn to keep her torso closer to vertical when pulling was to set up in her deadlift stance, then do overhead squats to a box set at the same height where her hips would be when initiating a deadlift.