What “they” say is correct. Peak torque will always fall right at peak VE. So you pull an additional 3 degrees, in how much of the map? On traction limited stuff, (street tire) I usually keep the timing out of it down low all the way to peak torque and ramp it back when the tire has less chance to break loose. AEM infinity has tables that can be referenced to speed or gear. Boost by gear or boost by speed are two of my favorite tuning tables.