OSX Yosemite Can't disable four-finger swipe Intro

I want to set a custom gesture for the four finger swipe left/right, but I noticed that four finger swipe was switching between spaces. I went in to system preferences->Trackpad and changed "Swipe between full screen apps" to be three fingers instead of four.

The Problem

Even though I have set three finger swipe be the "change spaces" gesture, four-finger swipe hasn't been disabled and it is ALSO switching spaces.

What I want

The reason why this is annoying is because I am setting a custom gesture with BetterTouchTool, the space switching is happening at the same time as the gesture I want. 

I want four finger swipe (between spaces) to be completely disabled so it wont happen at the same time as my custom gesture. Because setting it to three fingers in system preferences seems to do nothing.
I resolved this issue by keeping four-finger-swipe as the change spaces gesture, and using three-finger-swipe as my custom gesture instead.