A Haki clash seems to ignore physical strength to some extend. Luffy's and Doflamingo's kicks also equally clashed on multiple occasions, without one overpowering the other, Luffy also equally clashed with Katakuri; aside from having his haki broken, he wasn't pushed back physically. One armed Shanks equally clashed with two armed Whitebeard on meds. Old Chinjao also clashed equally with Luffy.
So
Base Luffy = Hybrid Kaido = Doflamingo = old Chinjao in physical strength? No, that's not it. I'm sure that boundman won't suddenly trash Kaido.
Boundman did trash Kaido in terms of physical strength, now Kaido has awakening to use, sure, and he has more stamina and regeneration than anyone, sure. But in terms of raw strength, base Luffy is at least his equal.
Luffy
grows each arc, his current physical strength is on par with Kaido, and yes no shit old Chinjao is physically strong.
Luffy even physically restrained Kaido and pulled him back from attacking Yamato in 1027, while laughing.
Luffy is the grandson of Garp, the guy with the strongest physical strength in the verse in his prime, you need to get this through your head, Luffy has ALWAYS been a physical monster who grows each arc, he split W7 while Zoro needed a sword to break free from a Chimney in the same arc .
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Zoro's combat speed is more than enough to deal with Katakuri, it was calced so many and many times.
WCI Luffy is faster than Zoro, by a lot. In movement and attack speed.