I have to agree with Triquetra about the EDs - Now that I have learned a bit about what they are, I find that when I work with a Thoth style deck, they make a lot of sense and help to clarify the spread. Mostly, I am doing a small daily spread for myself, but I occasionally get the opportunity to read for another, and have found it most helpful to use the system the deck was designed for. Many times, I have found meanings from a Rider style seem most pertinent to a Thoth spread and vice versa - I too have learned to go with my instincts in this regard. As one other student in my Tarot class says, the cards don't lie - you just have to learn how to listen.
Thea Lynx