This is what the dynojet is telling me about 2L on gasoline
Some boost controller sinusoidal activity is typical when the state-space type of boost controllers are improperly configured to respond fast enough.
So it is very easy to see what is happening. The boost rockets to some value, the controller over compensates, and it falls off, then the controller re-compensates back to the original value, over shoots again slightly, overcompensates, back and forth a couple times until it settles out near the original starting value but without overshoot and over compensation.
This is a very typical control system behavior. And since we know engine torque follows boost pressure when VE is a flat number, which is clear and easy to tell from the flat torque curve, we must conclude that whatever the initial boost pressure number is (24psi) is the same across the board, because torque is a flat line there which tells us the engine isn't losing efficiency until after 8,000rpm which is consistent with what we know about the SR20VE head.