that’s right, Smoker’s causal movement speed
Tashigi’s body is not Smoker’s body that has a neural efficiency that is much different than Tashigi who is a lesser fighter. The bodies are différent. simple. Sanji couldn’t properly run in Nami’s body because he was forced to have her lungs and legs and muscles and neural networking
When has Katakuri hit Luffy in his normal form without resorting to FS? He can’t tag with Mogura, correct. He sucks. He uses FS to make up for his failure as a fighter without it
Yet again, you are comparing apples and oranges.
But shouldn't Smoker be able to "use" the maximum amount of strength from Tashigi's body. You think she's physically stronger than Zoro and Sanji after all - and yet, Smoker couldn't tag Luffy for once, with a body physically stronger than Smoker's lol.
Nami is not a fighter, Tashigi is. Honestly, you cannot go around making threads about Tashigi being physically stronger than Zoro or Sanji and then believing Smoker couldn't use that power of hers for competent combat abilities.
FS is part of his combat abilities. I know this ability is a pain in the ass but you have to include that; it's Kata's main forte after all. His FS also managed to tag and hit Snake Man on several occasions.
Only because Vergo absolutely sucks as a fighter and was hit twice by Sanji's DJ doesn't mean Katakuri sucks too. Vergo is simply a tank; useful for characters like Sanji and Smoker but one shot material for the likes of Katakuri, Zoro and other characters capable of beating the living shit outta him.