I'd be very surprised if the booster was the short straw in travel.
I don't mean to sound harsh but I don't trust a YouTube video for info. I take sourceless info with a 55 gallon drum of salt.
We're using parts out of their original design. Some of this stuff is likely broken down in troubleshooting manuals but might need to be adapted. Some is locked down OEM for safety.It irritates me how partially-discovered all this stuff is.
This is speculation but there might be an expected travel to pressure map for the OEM application that likely doesn't match it's new usage. If it's adjusting the boost on the fly it might need this expected travel to pressure to do it's thing quickly and smoothly.