How did you get that much boost between shifts?

I have a MAP EF2 Turbo in my EVO X GSR and did a log WITHOUT NLTS and had boost 6-10 psi between shifts.

Than i did a log with ( NLTS ON ) ,my boost is like 8-12 psi between shifts.

I didn't change the timing map, because i don't see how that would help to keep the boost up with retarding timing in this cells without fuel (fuelcut) at this moment.
Maybe i don't understand the logic of this system.

Should i try to retard timing in this cells around 140-180 Load and 5500-6000rpm? If yes, how much should i retard the timing in this cells?

This is pretty badass but only of you street race all the time.