As Still Waters discussed, a cold telepathic reading is VERY difficult, for many reasons, including the ones he listed.
While all tests have merit, I think perhaps a better test would be one designed to test to what degree of 'priming' is necessary for the telepathic communication to take place.
Yes, I know, this violates all laws of scientific inquiry - except it doesn't. Let me explain.
For example, the OP explained that he used a random number generator to select the word. Well, we already know from abundant literature that the stronger of an EMOTIONAL connection there is to the message, the more likely it is to go through. I mean, COME ON GUYS, let's get SCIENTIFIC!
Let's stop wishing telepathy was like a conventional sense, where one simply 'lay eyes' on it for it to work, and FIGURE IT OUT! We need multiple experiments, with multiple groups, encompassing multiple conditions and situations, including emotional, cognitive, even physical factors considered.
I mean, SHEESH!
