I think slowing down less then 80.. Sound like if you are skipping because your finger are not in place.. After your warm ups, make chord changing a part of warm-ups.. No speed, just get the finger where they belong. Try just going back and forth with the chord changes you have trouble with.. Slowly, then pick up speed.
You didn't mention if you look through the number 6.. "Seamless chord changes"
Maybe skim back through the first few sections 1 & 2 to make sure you didn't miss something.
Nothing wrong with going ahead, just remember to go back where you had trouble.
Sometimes that one step ahead helps you spot what you missed before.