I would not become overly hung up on trying to get PhotoFocus - you'll end up putting too much pressure on yourself and not fall into the accelerative learning state that is central to PhotoReading. The main idea is to relax the gaze, see both pages simultaneously, and not fixate on any word or words, which would engage the conscious mind and narrow the "cone of attention", limiting the access to the other-than-conscious mind.
Play with PhotoFocus state. Another way to get a feel for the PhotoFocus state is an exercise from the martial arts - get a friend, stand several feet away from them, and as you gaze at them try to take in their whole body from head to toe without concentrating on any one feature. You're training your peripheral perceptions. When driving, occasionally see if you can see out the windshield and at the same time see out the rearview and side mirrors. Make a game of it, keep it light.