Not sure what type of tracking you want, I have been tracking for over 10 years for animals, humans and vehicles. I have attended some of those classes you mentioned. The most recent with David Scott Donelan. I prefer tactical tracking.(must be the rush) Here are a couple of suggestions. You can learn a lot from books but I still suggest the classes.

Tactical Tracking Operations
by David Scott-Donelan

The SAS Guide to Tracking
by Bob Carss

Fundamentals of Mantracking
by Donald Cooper

Thanks
Ted Fisher
Vermilion County Search and Rescue
Tactical Tracker