Wastegate Solenoid A Range/Perf (HIGH)

Got my vacuum leak all sorted. Did a WOT today & around 6500 rpm it through a P0244 code on my subaru 32bit ecu. The file is a stock AZ1E400C rom file. Would i be best to change the fuel cut to 8000rm -8500 rpm in the fuel cut tab? The thing has ported heads, 1mm over size valves and behive valve springs. Just want a second opinion before i go and change my base map, fuel & timing maps? Thanks Al