I think you misunderstand the elastic effect. Its based on the difference between skills. Say your Driving/Handling are high and OD is low then training OD will be faster then normal. As OD gets closer in skill to Driving/Handling the elastic effect decreases.
Most definitely. I appreciate the explanation. It appears, from what I have read hear and elsewhere since posting the question, that once a certain level has been obtained from training 1v1, for example, it remains in effect until an associated skill is trained (OD in your example). I did not understand the various relationships between skills. I have not yet been able to access the chart at Coach Parrot's website linked elsewhere, but Alonso, provided the basics in his post here. Again, much appreciated to you and all who contribute to the knowledge base in the forums. The game is better for it.