I suggest you pull yourself back to alertness Make sure you have more of an Alpha/Beta alertness. I find that the theta level is too deep for effective activation and spontaneous activation. By storing it there during photoreading it becomes as difficult to recall information, just as it is to recall your dreams moments after being abruptly woken up.
When you say your affirmations prior to photoreading add one tell yourself something like. My mind will maintain a relaxed alertness while I am photoreading. This will help keep you in the optimum accelerative learning state which is alpha/beta. Deeper is not always better 
Alex
