Why the macbook pro built in trackpad keeps slow despite maximum speed?

The first cursor movement is trackpad side to side. Despite the settings being at 8, I think its behaviour is as usual, as I make faster movements in the trackpad, the speed increases.

At the end of the video, you can see that right after setting the speed to 8, it seems to respond and go fast. Although later it goes back to normal.

I'd like the trackpad to be fast as per the BTT settings.

I've also installed the priority access plugin, but still face the same issue.

BetterTouchTool can not make the trackpad faster than the maximum allowed by Apple.

Isn't there a way to disable the Apple setting that sets the speed according to faster movements on the trackpad? May in that case be more responsive to BTT?

I don't know why right after configuring maximum speed, it goes crazily fast and then goes back to normal.

I'd appreciate to know why this is the case.

Thanks a lot for the prompt answer, awesome app!

Unfortunately I don't know of any way to get around that limitation.