I'm not sure if this is true, but I think your readings will only be as clear as your willingness to believe the possibility of such things.
I did two readings with Erin, and both of them provided some insight, but nothing too spectacular that would send shivers up my back. They sounded more like very intuitive thoughts/suggestions anyone else could have offered me, psychic or not. In one reading I asked Erin to tell me the names of my Spirit Guides, because I really wanted to know that info but she couldn't get names for me, and suggested I try contacting the guides myself. That didn't sit well with me at that time.
BUT, then a short while later I started working with a life coach that is also a psychic and she started to help me get comfortable with the whole concept of guides, spirits, psychic phenomena etc. and slowly I started to release my doubts and beliefs in the area. My ego fought back with fear, but eventually I started making progress.
Shortly after that I made contact with my own spirit guides and learned their names through meditation and help from Erin's articles on how to do that (which she recommended in her reading). THen I understood why Erin couldn't get me their names, because if she did I wouldn't have gone through the growth phase to learn to do it myself. I'm not sure if the guides told her that, or if they just didn't tell her names because they wanted to to speak to me directly.
Anyway, I have become MUCH more open to the whole process and just last week I booked a reading with a totally different psychic who doesn't know me at all. I wanted to see how accurate she could get now that I was much more open to it. Her reading was totally dead on. She answered my questions which was really cool, but to really top things off she also told me that she sees me moving soon to a new city, with much more room for me and my family. That blew me away because we just bought a house on a 5 acre lot in a different city and are moving in a month or so. Besides myself, only a few people in my family know about this and there is no info that I gave her that would lead her to know that.
So I think that the accuracy of psychic readings is also largely dependant on your ability to accept a reality in which such things can exist.
If you're stubbornly opposing the possibility and your ego is afraid of the implications of such things being true and you're just doing your reading to prove to yourself that it's all fake, don't be surprised if your reading is "weak".
Oh, and don't bother wasting your time "testing" a psychic. Just the intention of trying to "test" them, sets the whole energy up for failure so they'll fail your ego's tests. It doesn't mean they are fraud's, it just means you're choosing to not allow such things into your world yet. Come back when you're more open minded.