The list is in order of importance in causing impairment. As far as the "pot makes you drive slower", it may or may not work in court but it is a fact in reality. Do you turn into a reckless speed demon when you drive high on pot? I didn't think so....LOL! You have to be kidding me here. Your list is correct in that everything you have mentioned are causes of impaired driving. What I find is ridiculous is when you state "In fact pot makes you drive slower and more carefully...." . Be sure to use that line in front of the courts.
https://cannabissupport.com.au/stoned-driving/driving-fast-facts/