"Two finger Tip Taps minimum required distance" not working

Two avoid mixing a Tip Tap with a simple double click, I tried to increase the distance. But even with a maximum setting of 1.5 and multiple restarts of BTT the Tip Tap is recognized when both fingers are close together.

Affected input device: Touchpad Macbook Air

  • Type of Mac: Macbook Air 13" late 2013, 8GB, 128SSD
  • macOS version: High Sierra 10.13.5
  • BetterTouchTool version: 2.530 (865)