I think that the "default 100" information in Radiant is incorrect. I mean, normally, there's no speed key, and if you give a speed key and write "100", you'll get a much slower moving door. And, funny enough, I think that "400" is actually the real default speed. So, you accidentally used nearly exactly the value that would make it move the way it moved as default. :)
Text on screen: You might somehow employ "target_print" to do what you want. Maybe your text message is compatible with that approach.