I'm getting ready to do my own Super Speed Science Vocabulary game. My only suggestion is keep it simple. The Super Speed 1000 words are words, that when mastered, help students have better fluency and hopefully better comprehension will follow. If you are going to use textbook words, just make your own SuperSpeed game with those words separately. That way you have more than one game to use as a reward for the Score Board....or just a fun activity that helps review or conclude a certain subject area. I don't know if this helps at all, but just keep it simple. Can you upload your Super Speed activity? I'd love to look at it.
I was just thinking....about textbook words......do you have gestures for them? I have seen the toughest vocabulary words be mastered in meaning with just using gestures....and months later, all I have to do is give the gesture, and they know the word. We even did it in a fast charades kind of game.
Good luck!!! Let me know how it all works out!