Few links on DS on pace:
https://helloracefans.com/handicapping/pace/speed-rations/
https://www.dailyracing.com/news/analysis/profiting-from-pace-figures-2/

It sounds like Derek doesn't do anything with horse racing anymore according to a article called "Goodbye to Horse Racing"

I learned a lot from Derek over the years. I was glad I answered his random FB post about "anyone looking to write about horse racing?" a few years back.

Since I know you read some of my articles, Derek gave me some guidance on what to write and how to tell a story... hence the personification of "Rail Guy" was born. Derek always said my style evolved into a very Damon Runyon-esque sort of style.

The best part is that all of the characters I ever wrote about were real people... and only the type of folks you'll meet by spending way too much of your time at the track (especially on weeknights!).

I think Derek will always have the bug for horse racing though... even when I tried to walk away to focus more on my career in the mid 2000's, I was always drawn back in!

Derek is back on You Tube and works with database handicapping.