How much did you "train" to get to that speed? I moved to dvorak a couple years ago and I'm actually at 80-90wpm. I used atypetrainer4mac to get to 50-60wpm, then I did this http://www.flickr.com/photos/deadsunrise/4338226640/ and I'm up to 85-90 but to get slightly faster now I have to invest too much time.
I'm not sure. I was at 60 WPM at age 16 according to Mavis Beacon and steadily increased over the last decade. IRC was my training program. :)
I do not even type correctly and I have had no formal training. I only use three fingers on each hand (index, middle and ring) and my right pinky finger to press Shift. I actually press the spacebar with my right index finger and occasionally my left thumb.
Sorry that I can't accurately answer your question!
Good luck with the site!