I generally go for smallest jump possible....for a Deadlift 5-10 lbs. If you overshoot by making a big jump and have a very fatiguing miss then you're pretty much done for the day. Deadlifts are unforgiving in this regard and you don't get a lot of opportunities (perhaps none) for failed attempts that can run your battery down to zero. If you make your 5-10 lb PR and wanna jump up another 10-20 lbs or so then go for it.