Deadlift set-up is largely about personal preference. It's the lift that has the most variation among quality lifters in terms of both pre-lift ritual and actual execution. Watch Dan Green, KK, and Bene Magnusson. These guys are all over the map in many respects regarding technique and approach.
What you want to look for is the qualities that DO overlap. One is that no good deadlifter spends a significant amount of time over the bar pre-lift. They all attack the lift very aggressively. And they all create a significant amount of tension throughout their body, particularly in their posterior chain, directly before initiating the pull.
Bird, this more or less amounts to a hard flex, which as we all know, can't be done for very long. It's easiest to flex your hamstrings hard if you start pulling against the bar first, but without actually trying to pull the bar off the ground. This is what pulling the slack out of the bar is all about. Instead of pulling the bar up, you pull your hips down. Hope this helps.