Polaroid's shouldn't be this frustrating.

I have now shot 7 out of the 10 Polaroid instant photo's that I purchased a little less than a week ago. And this far, 3 have come out. The 3 that were posted in my last blog. I just don't get it. I have a full darkroom, and without thinking twice am able to calculate the different exposure and processing times for both film and paper. Yet I can't seem to work these at all. There is even a table for development times on each shot. I can see why Polaroid went to the SX-70/600 series film-packs.