You're not really supposed to be understanding anything CONSCIOUSLY during the PR step. That happens during activation. As long as you maintain the soft gaze and the accelerative learning state, you're fine. Just remember to be open, both physically and emotionally, to the information that's coming in. Enjoy the experience!
After you've completed the PR step and incubated the material, superreading and dipping is the step which will retrieve the information for you at a conscious level. That's when you'll start to see it come together.
Photoreading upside down is really okay, since your other than conscious mind can interpret it anyway.
KWLee