The amount that you have to move the mouse downwards to get the dock to trigger is too high in my opinion. I've only found the following settings:
defaults write com.apple.dock autohide-time-modifier -float 0
This set the speed of the transition to 0, but does not make it easier to trigger.
defaults write com.apple.Dock autohide-delay -float 0
This sets the delay to 0 once triggered, but does not make it easier to trigger.
I want it to launch the moment the mouse touches the edge of my screen.
Edit: the suggested duplicate has no answers that answer this question as addressed in the text above.