I just went through this on Monday with the FAA. I got a letter of discontinuance because of the weather for this Friday, and the weather still isn't looking good for that day either.
I used every short-term memory aid available, as well as this:
http://www.flashcardexchange.com/flashcards/list/489031
Take your PTS and write as small as you can next to each item for FOI's. PEMA, PIM, PPAR, CPRDRFAR, EDSIE, OFACCTSO, SSR, etc. My favorite was OFACCTSO - Over Feeding Alligators Can Cause Torn Skin Occasionally. Make up your own, but they helped me get through it.
When you are going through the FOI's with the Inspector, just hold your PTS up in front of your lap and follow along with each item that he/she is asking you, and DON'T let the Inspector see what you have written in there. Just don't stare at it...briefly glance down at it if you need the help of the acronym. Do not write a thesis, but simply the acronyms to assist you with the memory aid. Even if he/she catches a glance at what you have written in there, it is no big deal. They WILL let you use the memory aid for recall. And, they will probably be happy to see you wanting to follow along with the PTS out in front of you, giving the appearance that you really know how to use the thing. Also, ruffle up your PTS a few times and bend the cover a bit to make it seem like you have used it quite a bit. Write your initials on the outside cover. If you get the first 20 minutes of items all correct, chances are that he/she will move right along into the other areas.
And, I agree. FOIs are a royal pain in the butt.
Hope this helps.