I am still here, but I'm no longer a participant in the time-predicting game. I'm afraid that further research will have to leave me behind.
At the time I did my work I was able to read a number of time-prediction models, but was not satisfied with them. So I took my own shot at it. It was a bit later when I realized that other sports had data that could extend the use of the basic formula.
I was surprised when American Scientist was willing to publish it, and I attribute this to a bit of luck. The editor, Michelle Press, was a runner, and this may have influenced her choice.
I like the formula as it stands, as it combines accuracy with simplicity.
So, I am watching the thread but have nothing further to contribute.