I've been sore for up to five days. Immediately post workout you should feel mentally drained. However you can pull-up/chin more reps/weight after you deadlift heavy -dunno why but give it a try.
As regards form, the bar should be as close to your body as possible from beginning to end. Also, its called a deadlift so when doing multiple reps think of it as multiples singles (make sure the bar is completely still before moving it). There are many stances and grips you can use, gear too.
When you lift the bar think that you are pressing your heels through the floor NOT that you are pulling the bar up. Remember to engage your core throughout the lift. You should be able to maintain tension whether you are breathing in, out or even holding your breath.