1Retired -
First off, more power to you for being retired!
As far as DRF variants go - they are in the 2014 pars from Cynthia Publishing:
http://www.cynthiapublishing.com/mm5/merchant.mvc
The par book has several features in it....the average variants by track, surface, and distance, as well as the incremental times by track, distance, and surface for all class levels at all the North American tracks. If you want to make your own velocity pars and ultimately daily variants like Brohamer does, this would be a fast way to get it going.
You can call those guys as well. I've spoken to them many times and have bought the pars book in the past.
Let me know what other questions you have.
Regards,
Chuck