I still disagree with you.
When is the only time you're Fury starved with BK + Lightning rune? When you have nothing to attack is the answer. If the ancients have something to attack then so do you, so the Fury starvation happens in exactly the same way whether or not you're running Ancients.
The only possible limiting factors in speed clearing are
1. Damage
2. Movement
Your setup sacrifices on both those points compared to a Focus + Restraint setup, you lose both damage and movement speed. What do you gain? Better Fury generation during the moments where Fury generation is not a problem anyway. Talent Weapon Master + Resource cost reduction in Paragon points and stop worrying about it.
As for your "Attack Speed" theory, it really doesn't make a lot of difference at all. At 45% attack speed it would take you about 20s to empty an 130 Fury bar (so assume 10 bonus Fury on each BK weapon + on Mighty belt). At 15% attack speed it would take around 23s, that's assuming you generate no Fury at all during that time other than the weapons passive generation.
The reality is that you're just wrong, it's not that your setup is bad or slow because it's obviously not, it's just that you're fabricating an issue that doesn't exist. 6 Wastes + 2IK+BK is fast but 6 Wastes + Focus/Restraint + BK is faster because you move faster and you do more damage, and there is no getting around those points.