No, I'm sorry but you're saying something stupid and it goes against what the manga shows.
You are inventing some % because yes
Many of the Ittoryu techniques are more lethal, Oda simply decided so, and Zoro has many types of skills and repertoire and each one specializes in something, but it is not as simple as putting some percentages of strength and speed.
Did i say Zoro doesn't have many types of Skills or dozens if not hundreds of Techniques?
Did i talk about Lethality?
I'm not Inventing any Percentage, it's revealed in Pound Cannon Technique
Zoro himself said against Ohm:
One Sword --- 36 Pounds Phoenix
Two Swords --- 72 Pound Phoenix (36 x 2)
Three Swords --- 108 Pound Phoenix (36 x 3)
It's simple, which One of these Three can use "Up To" 100% of Zoro's Strength? Obviously Three-Swords
Now, can Zoro use 108 Pound Cannon with only Two Swords? Obviously Not
Can He use 72 Pound Cannon with only One Sword? Obviously not
So Oda is revealing to you that there is a Cap of Strength that can be used in each Sword-Style
Since Three is 100% & was represented by 108
Then One is 33% cuz it's represented by 1/3 of 108 (36)
And Two is 66% cuz it's represented by 2/3 of 108 (72)
It's Simple Math
Swords Attacks Scale with Physical Stats (And can be further Enhanced with Haki ofc)
For example, Brook & Zombie Ryuma Use the exact same Sword-Style
But Zombie Ryuma was vastly Superior cuz He had Higher Physical Stats
Zoro was Perfectly Matched against Zombie Ryuma with Two-Sword Style, They were complete Equals
But then Zoro switched to only One-Sword, what happened? He Blitzed him, He landed his Attack first, something He couldn't do with Two Swords. Meaning Less Swords Scale with more Speed
Zoro's Techniques are different in the way They are Executed & how They connect with the Target, but how Powerful They are depends on how much Strength & Speed Zoro wanna apply to them