Edge transition is how fast the board transitions from edge to edge, speed wise, in terms of how fast or slow and also how edgy it is. when you initiate a turn a board sometimes is nice and mellow and smooth and others bite a little harder.
My best guess at Edge Load is how high or low the board sits so when you aproach the wake at a usually higher speed it can feel more floating and smooth (ie: any Murray model) or more rigid and fast (drifter/project-TFD-3ds, Subjekt). I really am guessing at this one?!?
Speed and lift sees to be directly related to the rocker line of the board. a 3-stage in this guide is supposed to go wake to wake and a continuous is more fast and out into the flats.
This sh*zz confuses me because the Parks is rated the highest of 3 which is correct but other boards that are just as abrubt as the parks like the Absolute and Gonzalez are rated signifigantly more as into the flats.