Well I can say that after reading Psychic self defense that I was a bit Neg-afide as well but I got over it. That book is like the ultimate guide to inducing paranoia and freaking people out. I consider that book to honestly be a giant propaganda document meant to scare people and cause a need, an attatchment to Robert Bruce. If he says "Be wary of negs, this is what it will be like, this is what you should look out for (because you have them without knowing it unless you use my methods, etc) and this is how to get rid of them. " Its one giant self fulfilling prophecy. I respect Roberts other works, Astral Dynamics, NEW, etc but this book I dont respect one bit. I too did the visualization you speak of with similar results. If you go into a trance and look for something most times you find it. We both went in looking for negs and found "them". After about a month of neg based fear and paranoia as well as an increase in negative experiences during sleep and normal projection I stood up one day and screamed "This is ridiculous! I wont take this anymore, all this stops now! I wont be controlled by my own fear!" and ever since that day ive had very few negative experiences, and when I have I was the one in control, quickly dominating the situation.