These are all not entirely correct. I was doing some experiment with AutoFighter Pro, and Full Void was about 5-8k more exp/hr when training at relatively weak but concentrated monsters. For example, training at Ghouls was a little faster with Full Void than with armour with some str bonus (Torso, Neitiznot Helm, etc). The downside was I used about 20% more food.
Also, at such monsters, using a Fury rather than Glory was 3-5k more exp an hour; using a Rune Defender rather than DFS was also about 5-8k more. These were not additive, though. Using Full Void with a Fury and Rune Defender was not 23k/hr faster. They were just faster than the alternatives (i.e., Full Void with a Fury and Def versus Regular Armor with same said equip).