Nope my concern about mind mapping during activation is that people get too carried away in detail.
You see if you have PhotoRead the information is already in your other than conscious mind. So activation is only to make it conscious and any mind mapping you do is only to help you access the rest in your other than conscious mind in the future. If you're doing a detailed mind map you are either experiementing to put the principle of that book to work or (and this would apply to any other book where you are putting a lot of detail onto the mind map as you activate) don't trust your mind. To build trust. Mind map at the end of an activation pass.
Naturally you will forget what you activated as you answer one question after another. That's why you mind map again at the end. To recall it again and strengthen the neural pathway.
Like I said activate in shorter blocks of time. Become aware of how you are using the time.
Alex