Nothing on the road scares me except me. There are, very certainly, faster cars out there. I'm the only one that scares me ;-)

You want to retard timng while boosting because this ECU is tuned to make good power NA - it increases advance at a rate that will cause knock to a high HP, FI car. When this ECU gets knock, it pulls timing WAY back - around 14* at WOT. if you take a few degrees out before it reaches that knock-causing peak, or take a degree or two up top where you might be knocking just from the high boost and advance, you'll end up making more power overfall by being able to maintain a steady smooth timing advance over your whole powerband without knock induced dropouts in your timing curve.