Not gonna lie, no matter how fast you type, there's always going to be a second limit that exists: the speed at which you can create sentences. Even if you can type 120 words per minute, if you can only think at 40 wpm, then your overall productive speed is still going to be stuck at 40 wpm. I think the best thing you can do is to try and match up your typing speed with your 'thinking' speed, but anything beyond that is kind of pointless though.
