I learned shorthand in 2 weeks and now I'm moving on to Spanish. You can't just PR something and then KNOW it you still have to use and remember it.
Instead of wasting time slow reading everything before you go back and study it - do the steps for a few minutes every night - not the actual PR step but superread, dip, or skitter then rapid read and even study read right before you go to bed. The repetition that is FAST and not boring is one of the points of this. If I was still in school I'd definately mind map during class instead of regular note taking. Save regular reading for last. You may only go from having to study a chapter for 4 hours to 2, but you still have to work.
If you can't relax during PRing- take more time relaxing before you read and PR the book upside down and tell your ego to not even try to see anything.