Personally, after reading and considering all this, I think tricks like NLP, music or drugs to get positive emotions for better PR results, do not seem right. They all seem to make the process 'unpure'.
I do like the remark about positive emotions caused by curiosity and interest. You should enjoy the things you are learning (I know, an old issue, also mentioned many times in the book and the forum).
I was wondering now, if a focus on the 'gutt-feeling' during the whole process can be a help and an indicator in this. (The guttfeeling is an communication-tool of our sub/beyondconsious.) So, using the gutt for checking if your goal is correct, if you are relaxing ok, and so on and if necessary adjust, untill it does feel right.
This way you feel good in every step of the photoreading process (better storage?) and you make sure that you are doing it all ok.