I'm just impressed that you are used to putting pages together before you go. Heck, I still have several trips I haven't yet scrapped. I make a point of sitting down and journaling the entire trip as soon as I get home. Then when I'm finally ready to scrap, the thoughts are all still there.
This is what I do too, journal right after the trip and scrap later. It might help to let some time pass before you scrap the trip if some parts were less than enjoyable. Journaling right away will help so you don't forget anything you do want to remember.