Pretty much, that's my understanding of it. Give the car what it wants for best power and performance, and it depends on the application. A blown car might want 11:1 or 11.5:1 or 12:1 at WOT. A naturally aspirated car might want 12.5:1 or 13:1 or 13.5:1 at WOT. Crusing on the highway, a car probably wants something closer to stoich, 14:1 or 14.5:1, or maybe it likes to be a little on the lean side, maybe 15:1. In between light load and WOT, can't say for sure. Have to see what the car likes I guess.
John