Focus on getting the triceps pumped to hell with these, to the tune of 4 sets of 15-20 reps.
You want a smooth transition from the pullover into the press part. No pausing at any point. We want to let the metabolites really accumulate and focus on creating significant metabolic stress, which is why the rest period between sets is only 60 seconds.
Scott Abel says that maximum load isn't the same thing as maximum weight and he wonders why most people don't get this. How much you can lift isn't the deciding factor; the deciding factor is how much stress a muscle endures.