Keep the shoulders relaxed until the point of explode. The only thing tight is your grip.
Keep your butt down throughout the lift. If you find your butt raising, do deadlifts to knee and hold for a few seconds. It's a lower back issue. If your pubic bone is hurting any you are doing it WRONG! I learned this the hard way.
I was taught to curl my hands in in order to rotate the bar easier as the hands are pulled into the torso when standing straight up right at the point of explode.
It's no different a movement than the clean. The hands are further apart, that's it. If you aren't making the bar "sing," you're not pulling right and jerking your shoulders after relaxing at the point of explode.