RE: Thoughts on just how fast ???
Only you can answer those questions by bench running it to see if it will jump on the pipe, and if the needle is too critical or not, with what ever prop you choose. Carbon props can have the blade area reduced and thinned for fine tuning. Don't expect a raw off the shelf prop to be the right one. You have to be willing to experiment. A good strong level throw at launch can make up for a lack of prop diameter [thrust], but if your airframe is not sytreamlined enough, you are beating a dead horse with a stick.