Only unrealistic to attain without going once through the course. If you're happy to spend the time you are now spending in regular reading for minimal comprehension that's fine. If you were to spend the same amount of time in the photoreading system then your goal can truely be attainable. However the main focus of the photoreading system is to obtain the information you need in the shortest possible time.
In all I find that I have better comprehension of the material than regular reading, the recall of the information even astounds me. I honestly couldn't imagine regular reading for minimal comprehension to me that's a gross waste of time (and I have plenty of time on my hands) I prefer minimal time spent to gain maximum comprehension anyday Having Photoread a book and found the information that I was seeking within 3 minutes... that served my purpose at the time.
I know that I could spend the time I used to spend on the books memorising it more... that might become a goal in the future it might not.
I can appreciate the disappointment. I did the Mega Speed Reading course 3 years ago (I completed the course). My comprehension went down and in the end my regular reading speed deteriorated, I don't believe that the is any such thing as one size fits all. And at the same time not everyone gets the hang of riding a bike at the same rate as everyone else. It's the same for photoreading.