Help with freezing boss ranked enemies?

If the giant hitbox is even bigger (it's most likely not because WM is affected by hitbox size and it was confirmed ages ago that giant WM is the same) it wouldn't even be noticeable. The hitboxes are only noticeable on huge creatures like golems or giant spiders, nothing else that is "giant sized" like most SM humanoid monsters.

Last time i checked, we had no conclusive evidence that hitbox size directly influences WM range.

It does though. You can even get such a huge WM range by transforming into a certain spider (I forget which ones) with transformation mastery and using WM.