I noticed that in a tune that I have that is NOT a turbonator tune, advance from rpm max graph line starts out at low rpm with high advance, for example 900 rpm might be at 54 degrees and 7000 rpm might be 39 degrees with advance decreasing as rpm increases. In turbonator tunes timing goes in the opposite direction, 900 rpm would be 28 degrees 5000 rpm might be 49 degree's. Can someone explain this?