Hi Carles,
I also only could read the PR book, and I also had problems with the activation step and I also have great faith in this method.
There are some methods for activation, it's good to know which type of person you are. You know: you can be visual, it can be that you feel mostly, and you can be auditory.
I think it's better if you know first which type of person you are.
This could be the cause, why you can't write ( or you can also say: draw) on a mind-map: Maybe you aren't visual.
I don't know the other methods ( because I'm visual, so i don't really need them), but maybe some other members know some more informations.
In the PR book, there are also explained two species: the manuel and the spontaneous activation.
In the PR book there is also written about the man who Photoread ten books a day. With this method you train to use your subconscious. This is like when you start cycling: You have train to get better. So when you train, you improve your using of the subconscious your.
Actually, I can't photoread ten books a day, cause I have not enough time, but I try to read at least one book a week, so i can train.
Something what also is important, is to be relaxed while the activation step.
So, go on with photoreading and train your activation moment.
Maybe you can also do the dictionnary game.
Good luck!!