Don’t forget about total organism stress. If an athlete’s life away from the track/field is filled with stress it’s going to impact what is or can be done on the track/field. It seems there are many stressors in your life and you’ve found the volume you are able to handle.
Who also didn’t have jobs or school to worry about. Charlie really seemed to emphasize just how important it was get his athletes carded or getting the club sponsorship money so they didn’t have any other stresses holding them back on the track.