only few months i´m playing whit the nistune so any advice i´m all hears 
My engine specs
Wiseco´s 88mm
Eagle rods
nismo 740cc
300degree fuel rais
JWT mild Cams
JWT valve springs
Nismo termostat
Worked hears/chambers
NKG iririum IX 8
Dual intake
AMS manifolds
GT525 turbos
Godspeed SMIC
Full 2.5´exhaust
AEM water/meth 50/50
Fuel 98 RON
I copy the BIN file from my old eprom that i run, only add +3 degrees timing in the last 4 cells to run the meth
The car runs great, the AFR´s around 11´s at WOT the boost is around 18psi
This is my timing map
I have only one issue, at idle the AFR´s is lean at 800rpm and is temp related.
Runing slow the normal temp is round 70ºc and the idle round 800rpm (reading lean AFR´s) ( TPS is at .42 )
Runing hard the temp go at 80ºc and at 80ºc temp the idle go up to 1000rpm and the AFR´s shows around 16/17