I discussed this with CF on this board. From that exchange I came away believing these lifts were probably at least 90% if 1RM. Charlie suggested that Ben’s extremely high speed endurance was matched by a high level of strength endurance, hence he could do a higher than average number of reps at higher intensities. In other words, a percentage intensity that might be a 4RM for the average lifter might be a 6RM for Ben.