I believe that VE is referenced during times of open loop such as start up and decel (aka. Deceleration enleanment). I have also tried setting the VE to stock,0,100,150 and the only thing I noticed when doing this and performing back to back 0-60runs and a circle back to the starting point was that when set to 150 my engine turned off during the run I had to pull over and it would not start till I re flashed it.