Well you are entitled to your opinion, but I try to at least explain again why percentages do not matter here. You must KILL your opponent, in as few hits as possible. This means that if your opponent has 60 HP, and you do 29 dmg, only 1 dmg point more will make the difference between 2 or 3 hits. It's only an increase of 3.3%, but if you have this increase, you will kill him in two hits, otherwise, he will have 2 HP left after your 2 hits and another chance to kill you.
This is where I think my build is located at, just a tiny bit beyond the limit, that allows a player using it to kill his opponents in 1 hit less (on average).
Also, I think that 15 AGI is another threshold for shielders. Below that, I get sidestepped and circled much easier than above it. And I already use light equipment, so I think THIS limit really shouldn't be lowered.
Now it would be helpful to actually have the stats of the average player (HP and armor), so you could really tweak your build for optimal average damage ratio.
On a side note...do you use heirloomed weapons? Because I think a 21/15 build with heirloomed Arabian Cavalry, Nordic Champion's or Military Cleaver might perform similar as a 24/15 with non-loomed stuff. As I said, looms can really make the difference, because 1h damage is very close to these 2 - 3 - 4 hit limits.